1
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Dissanayake GC, Martinez JB, Garg G, Ndi C, Markley JL, Hanson PR. Synthesis of Simplified 2-Desmethyl Sanctolide A Analogs. J Org Chem 2024; 89:9783-9788. [PMID: 38989836 DOI: 10.1021/acs.joc.4c00158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
A one-pot, sequential phosphate tether-mediated method for the synthesis of simplified 2-desmethyl sanctolide A analogs is reported. Western side-chain diversification was achieved using a pot-efficient, sequential cross metathesis (CM)/ring-closing metathesis (RCM)/H2/dephosphorylation procedure. Further diversification was achieved by Me3Al-mediated amide formation, Yamaguchi esterification, and RCM macrocyclization to access five C11/C12 Z-configured, 2-des-methyl sanctolide A analogs with improved stability.
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Affiliation(s)
- Gihan C Dissanayake
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James B Martinez
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Gaurav Garg
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Cornelius Ndi
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Jana L Markley
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Paul R Hanson
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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2
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Dissanayake GC, Ndi CN, Markley JL, Martinez JB, Hanson PR. Total Synthesis of Sanctolide A and Formal Synthesis of (2 S)-Sanctolide A. J Org Chem 2023; 88:805-817. [PMID: 36602547 DOI: 10.1021/acs.joc.2c01922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Two synthetic strategies employing phosphate tether-mediated one-pot sequential protocols for the total synthesis of the polyketide nonribosomal peptide macrolide, sanctolide A, and the formal synthesis of the (2S)-epimer of sanctolide A are reported. In this work, a phosphate tether-mediated one-pot sequential ring-closing metathesis/cross metathesis/substrate-controlled "H2"/tether removal approach was developed to accomplish the total synthesis of the natural product sanctolide A.
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Affiliation(s)
- Gihan C Dissanayake
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Cornelius N Ndi
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Jana L Markley
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James B Martinez
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Paul R Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
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3
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Javed S, Ganguly A, Dissanayake GC, Hanson PR. An Iterative Phosphate Tether Mediated Approach for the Synthesis of Complex Polyol Subunits. Org Lett 2022; 24:16-21. [PMID: 34898227 DOI: 10.1021/acs.orglett.1c03350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A pot-economical approach to advanced polyol subunits is reported. The key reactions involved are iterative use of a phosphate tether-mediated one-pot sequential RCM/CM/H2 with subsequent utilization of either a regio-/diasteroselective cuprate addition or a Pd-catalyzed reductive allylic transposition. This method highlights the asymmetric synthesis of 12 complex polyol subunits in 4-6 one-pot sequential operations with a total of 12-14 reactions, of which 4-5 are catalytic, with minimal workup and purification procedures.
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Affiliation(s)
- Salim Javed
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Arghya Ganguly
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Gihan C Dissanayake
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Paul R Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
- Department of Chemistry, University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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4
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Ganguly A, Javed S, Bodugam M, Dissanayake GC, Chegondi R, Hanson PR. Synthesis of the C1−C16 Polyol‐Containing Macrolactone of 13‐Desmethyl Lyngbouilloside, an Unnatural Analog of the Originally Assigned Structure of (−)‐Lyngbouilloside. Isr J Chem 2021. [DOI: 10.1002/ijch.202100019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Arghya Ganguly
- Department of Chemistry University of Kansas 1251 Wescoe Hall Drive Lawrence KS 66045-7582 USA
- Department of Chemistry University of Kansas, 1140 Gray-Little Hall 1567 Irving Hill Road Lawrence KS 66045 USA
| | - Salim Javed
- Department of Chemistry University of Kansas 1251 Wescoe Hall Drive Lawrence KS 66045-7582 USA
| | - Mahipal Bodugam
- Department of Chemistry University of Kansas 1251 Wescoe Hall Drive Lawrence KS 66045-7582 USA
| | - Gihan C. Dissanayake
- Department of Chemistry University of Kansas 1251 Wescoe Hall Drive Lawrence KS 66045-7582 USA
- Department of Chemistry University of Kansas, 1140 Gray-Little Hall 1567 Irving Hill Road Lawrence KS 66045 USA
| | - Rambabu Chegondi
- Department of Chemistry University of Kansas 1251 Wescoe Hall Drive Lawrence KS 66045-7582 USA
| | - Paul R. Hanson
- Department of Chemistry University of Kansas 1251 Wescoe Hall Drive Lawrence KS 66045-7582 USA
- Department of Chemistry University of Kansas, 1140 Gray-Little Hall 1567 Irving Hill Road Lawrence KS 66045 USA
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5
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Mandal S, Banerjee J, Maity S, Chattopadhyay SK. Sequential Two‐Fold
Claisen
Rearrangement, One‐Pot Ring‐Closing Metathesis and Cross‐Metathesis as a Route to Substituted Benzo[
b
]azepine‐2‐one, Benzo[
b
]azepine and Benzo[
b
]oxepine Derivatives. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202000216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Shyamasankar Mandal
- Department of Chemistry University of Kalyani Kalyani 741235 West Bengal India
| | - Jeet Banerjee
- Department of Chemistry University of Kalyani Kalyani 741235 West Bengal India
| | - Sougata Maity
- Department of Chemistry University of Kalyani Kalyani 741235 West Bengal India
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6
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Friedrich RM, Sreenilayam G, Hackbarth J, Friestad GK. Unified Strategy for 1,5,9- and 1,5,7-Triols via Configuration-Encoded 1,5-Polyol Synthesis: Enantioselective Preparation of γ-Sulfonyl-α-silyloxyaldehydes and Iterative Julia-Kocienski Coupling. J Org Chem 2018; 83:13636-13649. [PMID: 30365891 DOI: 10.1021/acs.joc.8b02033] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diverse classes of natural products contain chiral 1,5-polyols, within which may be stereochemical triads of 1,5,9- and 1,5,7-triols. Biological activities associated with compounds containing these motifs warrant targeted synthetic strategies to access all stereoisomers of a 1,5-polyol family from cheap and easily accessible reagents while avoiding the need to determine configurations at each alcohol stereocenter. Here, we address these problems via design and implementation of an iterative configuration-encoded strategy to access 1,5-polyols with unambiguous stereocontrol; the coupling event exploits Julia-Kocienski reactions of enantiopure α-silyloxy-γ-sulfononitriles. These building blocks, bearing sulfone at one terminus and α-silyloxyaldehyde (in latent form) at the other, were prepared via asymmetric catalysis. An efficient scalable route to these building blocks was developed, leading to enantiopure samples in multigram quantities. Preliminary studies of acetals as the latent aldehyde functionality in the α-silyloxyaldehyde showed that Julia-Kocienski coupling of these building blocks was effective, but iterative application was thwarted during acetal hydrolysis, leading to use of nitrile to perform the latent aldehyde function. A variety of 1,5-polyols, including a 1,5,9,13-tetraol and a differentially protected 1,5,9-triol, were prepared, validating the approach. The accompanying paper describes the application of this configuration-encoded 1,5-polyol synthesis to 1,5,9- and 1,5,7-triols found in tetrafibricin.
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Affiliation(s)
- Ryan M Friedrich
- Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United States
| | | | - Jacob Hackbarth
- Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United States
| | - Gregory K Friestad
- Department of Chemistry , University of Iowa , Iowa City , Iowa 52242 , United States
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7
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Prada Gori DN, Permingeat Squizatto C, Cornier PG, Delpiccolo CML. Design of a Selective Ring-Closing Enyne Metathesis-Reduction for the Generation of Different Synthetic Scaffolds. J Org Chem 2018; 83:12798-12805. [PMID: 30247910 DOI: 10.1021/acs.joc.8b01511] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A tandem process of ring-closing enyne metathesis (RCEYM)-reduction using modern ruthenium catalysts and a hydrogen donor is described. This straightforward methodology is useful for C(sp3) generation under mild reaction conditions. Variables such as solvent, catalyst, hydride source, and temperature were adjusted toward the exclusive formation of different products.
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Affiliation(s)
- Denis N Prada Gori
- Departamento de Química Orgánica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Instituto de Química Rosario (CONICET-UNR) , Rosario 2000 , Argentina
| | - Caterina Permingeat Squizatto
- Departamento de Química Orgánica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Instituto de Química Rosario (CONICET-UNR) , Rosario 2000 , Argentina
| | - Patricia G Cornier
- Departamento de Química Orgánica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Instituto de Química Rosario (CONICET-UNR) , Rosario 2000 , Argentina
| | - Carina M L Delpiccolo
- Departamento de Química Orgánica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , Instituto de Química Rosario (CONICET-UNR) , Rosario 2000 , Argentina
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8
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Markley JL, Hanson PR. P-Tether-Mediated, Iterative S N2'-Cuprate Alkylation Strategy to Skipped Polyol Stereotetrads: Utility of an Oxidative "Function Switch" with Phosphite-Borane Tethers. Org Lett 2017; 19:2556-2559. [PMID: 28471180 DOI: 10.1021/acs.orglett.7b00852] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The development of a P-tether-mediated, iterative SN2'-cuprate alkylation protocol for the formation of 1,3-skipped polyol stereotetrads is reported. This two-directional synthetic strategy builds molecular complexity from simple, readily prepared C2-symmetric dienediols and unites the chemistry of both temporary phosphite-borane tethers and temporary phosphate tethers-through an oxidative "function switch" of the P-tether itself-to generate intermediates that were previously inaccessible via either method alone.
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Affiliation(s)
- Jana L Markley
- Department of Chemistry, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66054-7582, United States
| | - Paul R Hanson
- Department of Chemistry, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66054-7582, United States
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9
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Markley JL, Hanson PR. P-Stereogenic Bicyclo[4.3.1]phosphite Boranes: Synthesis and Utility of Tunable P-Tether Systems for the Desymmetrization of C 2-Symmetric 1,3-anti-Diols. Org Lett 2017; 19:2552-2555. [PMID: 28471175 DOI: 10.1021/acs.orglett.7b00851] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The development of P-stereogenic bicyclo[4.3.1]phosphite borane tether systems for the desymmetrization of C2-symmetric dienediols is reported. This report highlights preliminary studies including tether installation and removal as well as chemoselective functionalization of the exocyclic olefin via diimide reduction or cross-metathesis. Most notably, a divergent oxidation strategy allows for the transformation of the bicyclic phosphite borane complexes to the corresponding phosphate or thiophosphate systems, highlighting the electronic attenuation of this P-tether system.
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Affiliation(s)
- Jana L Markley
- Department of Chemistry, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66054-7582, United States
| | - Paul R Hanson
- Department of Chemistry, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66054-7582, United States
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10
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Javed S, Bodugam M, Torres J, Ganguly A, Hanson PR. Modular Synthesis of Novel Macrocycles Bearing α,β-Unsaturated Chemotypes through a Series of One-Pot, Sequential Protocols. Chemistry 2016; 22:6755-6758. [PMID: 27059428 PMCID: PMC5094705 DOI: 10.1002/chem.201601004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Indexed: 11/08/2022]
Abstract
A series of one-pot, sequential protocols was developed for the synthesis of novel macrocycles bearing α,β-unsaturated chemotypes. The method highlights a phosphate tether-mediated approach to establish asymmetry, and consecutive one-pot, sequential processes to access the macrocycles with minimal purification procedures. This library amenable strategy provided diverse macrocycles containing α,β-unsaturated carbon-, sulfur-, or phosphorus-based warheads.
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Affiliation(s)
- Salim Javed
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 (USA)
| | - Mahipal Bodugam
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 (USA)
| | - Jessica Torres
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 (USA)
| | - Arghya Ganguly
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 (USA)
| | - Paul R. Hanson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 (USA)
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11
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Perez F, Waldeck AR, Krische MJ. Total Synthesis of Cryptocaryol A by Enantioselective Iridium-Catalyzed Alcohol C-H Allylation. Angew Chem Int Ed Engl 2016; 55:5049-52. [PMID: 27079820 PMCID: PMC4834877 DOI: 10.1002/anie.201600591] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Indexed: 11/06/2022]
Abstract
The polyketide natural product cryptocaryol A is prepared in 8 steps via iridium catalyzed enantioselective diol double C-H allylation, which directly generates an acetate-based triketide stereodiad. In 4 previously reported total syntheses, 17-28 steps were required.
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Affiliation(s)
- Felix Perez
- University of Texas at Austin, Department of Chemistry, 105 E 24th St. (A5300), Austin, TX, 78712-1167, USA
| | - Andrew R Waldeck
- University of Texas at Austin, Department of Chemistry, 105 E 24th St. (A5300), Austin, TX, 78712-1167, USA
| | - Michael J Krische
- University of Texas at Austin, Department of Chemistry, 105 E 24th St. (A5300), Austin, TX, 78712-1167, USA.
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12
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Kotha S, Aswar VR. Target Specific Tactics in Olefin Metathesis: Synthetic Approach to cis-syn-cis-Triquinanes and -Propellanes. Org Lett 2016; 18:1808-11. [DOI: 10.1021/acs.orglett.6b00537] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400 076, India
| | - Vikas R. Aswar
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400 076, India
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13
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Perez F, Waldeck AR, Krische MJ. Total Synthesis of Cryptocaryol A by Enantioselective Iridium-Catalyzed Alcohol C−H Allylation. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Felix Perez
- University of Texas at Austin; Department of Chemistry; 105 E 24th St. (A5300) Austin TX 78712-1167 USA
| | - Andrew R. Waldeck
- University of Texas at Austin; Department of Chemistry; 105 E 24th St. (A5300) Austin TX 78712-1167 USA
| | - Michael J. Krische
- University of Texas at Austin; Department of Chemistry; 105 E 24th St. (A5300) Austin TX 78712-1167 USA
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14
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Bodugam M, Javed S, Ganguly A, Torres J, Hanson PR. A Pot-Economical Approach to the Total Synthesis of Sch-725674. Org Lett 2016; 18:516-9. [PMID: 26760683 PMCID: PMC4852165 DOI: 10.1021/acs.orglett.5b03547] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A pot-economical total synthesis of antifungal Sch-725674, 1, is reported. The approach takes advantage of a number of one-pot, sequential transformations, including a phosphate tether-mediated one-pot, sequential RCM/CM/chemoselective hydrogenation protocol, a one-pot tosylation/acrylation sequence, and a one-pot, sequential Finkelstein reaction/Boord olefination/acetonide deprotection procedure to streamline the synthesis route by reducing isolation and purification procedures, thus saving time. Overall, an asymmetric route has been developed that is efficiently accomplished in seven pots from phosphate (S,S)-triene and with minimal purification.
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Affiliation(s)
| | | | - Arghya Ganguly
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
| | - Jessica Torres
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
| | - Paul R. Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
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15
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Chegondi R, Hanson PR. Synthetic Studies to Lyngbouilloside: A Phosphate Tether-Mediated Synthesis of the Macrolactone Core. Tetrahedron Lett 2015; 56:3330-3333. [PMID: 26388654 PMCID: PMC4572573 DOI: 10.1016/j.tetlet.2015.01.109] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A concise synthetic pathway to the originally assigned structure of lyngbouilloside macrolactone (3) is reported. The core macrocycle 3 was synthesized via a phosphate tether-mediated, one-pot, sequential RCM/CM/chemoselective hydrogenation reaction, Roskamp homologation, and a high yielding Boeckman acylketene cyclization.
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Affiliation(s)
- Rambabu Chegondi
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
| | - Paul R. Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
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16
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Hanson PR, Jayasinghe S, Maitra S, Markley JL. Phosphate tethers in natural product synthesis. Top Curr Chem (Cham) 2014; 361:253-71. [PMID: 25518970 DOI: 10.1007/128_2014_572] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Recent advances in phosphate tether-mediated natural product synthesis are reviewed. Synthetic approaches toward dolabelide C, (-)-salicylihalimide A, (-)-tetrahydrolipstatin, and (+)-strictifolione are included. In addition, current efforts in method development are briefly reviewed, including a detailed study on the effect of stereochemical complexity on the phosphate-mediated, diastereoselective ring-closing metathesis reaction and recent advances in multi-reaction, one-pot sequential processes mediated by the phosphate tether. Overall, this review seeks to highlight the utility of phosphate triesters to serve as multifunctional tethers with protecting group and latent leaving group characteristics and the ability to orchestrate multiple, orthogonal reaction pathways to allow for the facile synthesis of complex, bioactive small molecules and their analogs.
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Affiliation(s)
- Paul R Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Dr., 2010 Malott Hall, Lawrence, KS, 66045-7572, USA,
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17
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Hanson PR, Jayasinghe S, Maitra S, Ndi CN, Chegondi R. A modular phosphate tether-mediated divergent strategy to complex polyols. Beilstein J Org Chem 2014; 10:2332-2337. [PMID: 25298800 PMCID: PMC4187035 DOI: 10.3762/bjoc.10.242] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 09/05/2014] [Indexed: 12/20/2022] Open
Abstract
An efficient and divergent synthesis of polyol subunits utilizing a phosphate tether-mediated, one-pot, sequential RCM/CM/reduction process is reported. A modular, 3-component coupling strategy has been developed, in which, simple “order of addition” of a pair of olefinic-alcohol components to a pseudo-C2-symmetric phosphoryl chloride, coupled with the RCM/CM/reduction protocol, yields five polyol fragments. Each of the product polyols bears a central 1,3-anti-diol subunit with differential olefinic geometries at the periphery.
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Affiliation(s)
- Paul R Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA
| | - Susanthi Jayasinghe
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA
| | - Soma Maitra
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA
| | - Cornelius N Ndi
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA
| | - Rambabu Chegondi
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA
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18
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2012. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.02.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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19
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Jayasinghe S, Venukadasula PKM, Hanson PR. An efficient, modular approach for the synthesis of (+)-strictifolione and a related natural product. Org Lett 2014; 16:122-5. [PMID: 24294936 PMCID: PMC4179430 DOI: 10.1021/ol403110p] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient, library amenable, "pot economical" total synthesis of (+)-strictifolione and the related natural product, (6R)-6[(E,4R,6R)-4,6-dihydroxy-10-phenyl-1-decenyl]-5,6-dihydro-2H-2-pyrone, are reported. This modular approach takes advantage of two consecutive phosphate tether-mediated, one-pot, sequential protocols, followed by a final cross metathesis to deliver both antifungal natural products in a three-pot process from the respective enantiomeric (R,R)- and (S,S)-trienes with minimal purification. A salient feature of this route is that additional protecting groups are not required as a result of the orthogonal protecting- and leaving-group properties innate to phosphate triesters.
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Affiliation(s)
- Susanthi Jayasinghe
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
| | | | - Paul R. Hanson
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582
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20
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Schmidt B, Kunz O. Stereoselective Synthesis of Dienyl Phosphonates via Extended Tethered Ring-Closing Metathesis. Org Lett 2013; 15:4470-3. [DOI: 10.1021/ol4020078] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Bernd Schmidt
- Institut fuer Chemie (Organische Synthesechemie), Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Oliver Kunz
- Institut fuer Chemie (Organische Synthesechemie), Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
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Chegondi R, Maitra S, Markley JL, Hanson PR. Phosphate-tether-mediated ring-closing metathesis for the preparation of complex 1,3-anti-diol-containing subunits. Chemistry 2013; 19:8088-93. [PMID: 23712660 DOI: 10.1002/chem.201300913] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Indexed: 11/10/2022]
Abstract
An array of examples of diastereoselective, phosphate-tether-mediated ring-closing metathesis reactions, which highlight the importance of product ring size and substrate stereochemical compatibility, as well as complexity, is reported. Studies focus primarily on the formation of bicyclo[n.3.1]phosphates, involving the coupling of C₂-symmetric dienediol subunits with a variety of simple, as well as complex, alcohol partners.
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Affiliation(s)
- Rambabu Chegondi
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA
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Fuwa H, Noguchi T, Noto K, Sasaki M. Tandem catalysis in domino olefin cross-metathesis/intramolecular oxa-conjugate cyclization: concise synthesis of 2,6-cis-substituted tetrahydropyran derivatives. Org Biomol Chem 2013; 10:8108-12. [PMID: 22948791 DOI: 10.1039/c2ob26189h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Herein, we describe the concise synthesis of 2,6-cis-substituted tetrahydropyran derivatives based on a domino olefin cross-metathesis/intramolecular oxa-conjugate cyclization (CM/IOCC) reaction. We have found that the domino CM/IOCC of δ-hydroxy olefins with α,β-unsaturated carbonyl compounds (e.g., trans-crotonaldehyde or N-acryloyl-2,5-dimethylpyrrole) could be efficiently achieved in the presence of the second-generation Hoveyda-Grubbs catalyst under elevated temperature conditions, directly affording 2,6-cis-substituted tetrahydropyrans in excellent yields with synthetically useful diastereoselectivity ("auto-tandem catalysis"). In addition, we have found that the domino CM/IOCC of δ-hydroxy olefins with α,β-unsaturated carbonyl compounds could be achieved simply by performing CM in the presence of a Brønsted acid in CH(2)Cl(2) at 25-35 °C, which delivered 2,6-cis-substituted tetrahydropyrans in good yields with excellent diastereoselectivity ("orthogonal-tandem catalysis"). To understand the mechanism of auto-tandem catalysis in the domino CM/IOCC reaction, we have investigated the role of ruthenium hydride complexes in the IOCC of a ζ-hydroxy α,β-unsaturated ketone as a model case.
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Affiliation(s)
- Haruhiko Fuwa
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
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Tello-Aburto R, Newar TD, Maio WA. Evolution of a protecting-group-free total synthesis: studies en route to the neuroactive marine macrolide (-)-palmyrolide A. J Org Chem 2012; 77:6271-89. [PMID: 22721171 DOI: 10.1021/jo301121f] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A full account of our synthetic work toward the first total synthesis of the neuroactive marine macrolide (-)-palmyrolide A is described. Our first-generation approach aimed to unlock the unknown C(5)-C(7) stereochemical relationship via the synthesis of four diastereomers of palmyrolide A aldehyde, a known degradation product. When these efforts provided inconclusive results, recourse to synthesizing all possible stereocombinations of the 15-membered macrolide was undertaken. These studies were critical in confirming the absolute stereochemistry, yielding the first total synthesis of (+)-ent-palmyrolide A. Subsequent to this work, the first protecting-group-free total synthesis of natural (-)-palmyrolide A is also reported.
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Affiliation(s)
- Rodolfo Tello-Aburto
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA
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