1
|
Morrison RJ, Hoveyda AH. γ-, Diastereo-, and Enantioselective Addition of MEMO-Substituted Allylboron Compounds to Aldimines Catalyzed by Organoboron-Ammonium Complexes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805811] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ryan J. Morrison
- Department of Chemistry; Merkert Chemistry Center; Boston College; Chestnut Hill MA 02467 USA
| | - Amir H. Hoveyda
- Department of Chemistry; Merkert Chemistry Center; Boston College; Chestnut Hill MA 02467 USA
| |
Collapse
|
2
|
Morrison RJ, Hoveyda AH. γ-, Diastereo-, and Enantioselective Addition of MEMO-Substituted Allylboron Compounds to Aldimines Catalyzed by Organoboron-Ammonium Complexes. Angew Chem Int Ed Engl 2018; 57:11654-11661. [PMID: 29969173 DOI: 10.1002/anie.201805811] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 07/02/2018] [Indexed: 01/21/2023]
Abstract
The first catalytic, broadly applicable, efficient, γ-, diastereo-, and enantioselective method for addition of O-substituted allyl-B(pin) compounds to phosphinoylimines (MEM=methoxyethoxymethyl, pin=pinacolato) is presented. The identity of the most effective catalyst and the optimal protecting group for the organoboron reagent were determined by consideration of the steric and electronic requirements at different stages of the catalytic cycle, namely, the generation of the chiral allylboronate, the subsequent 1,3-borotropic shift, and the addition step. Aryl-, heteroaryl-, alkenyl- and alkyl-substituted vicinal phosphinoylamido MEM-ethers were thus accessed in 57-92 % yield, 89:11 to >98:2 γ:α selectivity, 76:24-97:3 diastereomeric ratio, and 90:10-99:1 enantiomeric ratio. The method is scalable, and the phosphinoyl and MEM groups may be removed selectively or simultaneously. Utility is highlighted by enantioselective synthesis of an NK-1 receptor antagonist.
Collapse
Affiliation(s)
- Ryan J Morrison
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| |
Collapse
|
3
|
Nomura K, Hirayama T, Matsubara S. Nucleophilic Cyclopropanation Reaction with Bis(iodozincio)methane by 1,4-Addition to α,β-Unsaturated Carbonyl Compounds. Chem Asian J 2009; 4:1298-303. [DOI: 10.1002/asia.200900123] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
4
|
Ariza X, Cornellà J, Font-Bardia M, Garcia J, Ortiz J, Sánchez C, Solans X. Stereocontrolled Synthesis of Highly Functionalized Quaternary Carbon Centers: A Route to α-Substituted Serines. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900609] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
5
|
Ariza X, Cornellà J, Font-Bardia M, Garcia J, Ortiz J, Sánchez C, Solans X. Stereocontrolled synthesis of highly functionalized quaternary carbon centers: a route to alpha-substituted serines. Angew Chem Int Ed Engl 2009; 48:4202-5. [PMID: 19415711 DOI: 10.1002/anie.200900609] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Three in a row! Highly functionalized quaternary amino polyols with three consecutive asymmetric carbon centers have been prepared through tandem hydroboration of allene 1 and addition to an aldehyde (see scheme; Cy = cyclohexyl, TBDPS = tert-butyldiphenylsilyl, Ts = 4-toluenesulfonyl). This one-pot process provides access to advanced intermediates for the enantioselective synthesis of alpha-substituted serines.
Collapse
Affiliation(s)
- Xavier Ariza
- Departamento de Química Orgànica, Fac. de Química, Institut de Biomedicina de la UB, Universitat de Barcelona, C/Martí i Franquès 1-11, 08028-Barcelona, Spain.
| | | | | | | | | | | | | |
Collapse
|
6
|
Possémé F, Deligny M, Carreaux F, Carboni B. (E)-α-Substituted γ-Alkoxyallylboronic Esters as New Reagents: Synthesis and Reactivity toward Aldehydes. J Org Chem 2007; 72:984-9. [PMID: 17253820 DOI: 10.1021/jo0622330] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed a synthesis of new allylboration reagents based on an allylic rearrangement. This approach led to the alpha-substituted gamma-alkoxyallylboronates 2 with a high stereoselectivity in favor of the E-isomer, independent of the organometallic used. We have also studied the reactivity of these reagents toward aldehydes, showing that the allylboration reaction occurs with an excellent diastereoselectivity to give the anti-diol derivatives 5. Moreover, the sequence can be carried out in a "one-pot" procedure avoiding the purification of allylboronates.
Collapse
Affiliation(s)
- Françoise Possémé
- Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
| | | | | | | |
Collapse
|
7
|
Ito H, Sato A, Taguchi T. Lewis acid promoted reactions of γ,γ-dialkoxyallylic zirconium species with various carbonyl compounds. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.09.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
8
|
Hirayama T, Oshima K, Matsubara S. Preparation of Enolate-Homoenolate Species as (Z)-γ-Siloxyallylmetal Equivalents: Sequential 1,4-Addition of Bis(iodozincio)methane to 1,4-Dicarbonylbutenes and Cyclopropanation. Angew Chem Int Ed Engl 2005; 44:3293-6. [PMID: 15844119 DOI: 10.1002/anie.200500133] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Takaharu Hirayama
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoutodaigaku-Katsura, Nishikyo, Kyoto 615-8501, Japan
| | | | | |
Collapse
|
9
|
Hirayama T, Oshima K, Matsubara S. Preparation of Enolate-Homoenolate Species as (Z)-γ-Siloxyallylmetal Equivalents: Sequential 1,4-Addition of Bis(iodozincio)methane to 1,4-Dicarbonylbutenes and Cyclopropanation. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500133] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
10
|
Hölemann A, Reissig HU. Regioselective Samarium Diiodide Induced Couplings of Carbonyl Compounds with 1,3-Diphenylallene and Alkoxyallenes: A New Route to 4-Hydroxy-1-enol Ethers. Chemistry 2004; 10:5493-506. [PMID: 15372682 DOI: 10.1002/chem.200400418] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Since its introduction into synthetic organic chemistry, samarium diiodide has found broad application in a variety of synthetically important transformations. Herein, we describe the first successful intermolecular additions of samarium ketyls to typical allenes such as 1,3-diphenylallene (7), methoxyallene (12) and benzyloxyallene (25). Reaction of different samarium ketyls with 1,3-diphenylallene (7) occurred exclusively at the central carbon atom of the allene to afford products 9 in moderate to good yields. In contrast, reductive coupling of cyclic ketones to methoxyallene (12) regioselectively provided 4-hydroxy-1-enol ethers 13, which derive from addition to the terminal allene carbon atom of 12, in moderate to good yields. Whereas the E/Z selectivity with respect to the enol ether double bond is low, excellent diastereoselectivity has been observed in certain cases with regard to the ring configuration (e.g. compound 13 b). Studies with deuterated tetrahydrofuran and alcohol were performed to gain information about the reaction mechanism of this coupling process, which involves alkenyl radicals. The couplings of samarium ketyls derived from acyclic ketones and aldehydes gave lower yields, and in several cases cyclopentanols 20 are formed as byproducts. Branched acyclic ketones and conformationally more flexible cyclic ketones such as cycloheptanone led to a relatively high amount of cyclopentanol derivatives 20, whose formation involves an intramolecular hydrogen atom transfer through a geometrically favoured six-membered transition state followed by a cyclization step. The samarium diiodide mediated addition of 8 b to benzyloxyallene (25) afforded the expected enol ethers 26, albeit in only low yield. Additionally, spirocyclic compounds 27 and 28 were obtained, which are formed by a cascade reaction involving an addition/cyclization sequence. In the novel coupling process described here methoxyallene (12) serves as an equivalent of acrolein. The 1,4-dioxygenated products obtained contain a masked aldehyde functionality and are therefore valuable building blocks in organic synthesis.
Collapse
Affiliation(s)
- Alexandra Hölemann
- Institut für Chemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
| | | |
Collapse
|
11
|
Stratmann O, Kaiser B, Fröhlich R, Meyer O, Hoppe D. The configurational stability of an enantioenriched alpha-thiobenzyllithium derivative and the stereochemical course of its electrophilic substitution reactions; synthesis of enantiomerically pure, tertiary benzylic thiols. Chemistry 2001; 7:423-35. [PMID: 11271529 DOI: 10.1002/1521-3765(20010119)7:2<423::aid-chem423>3.0.co;2-y] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The lithium compound (S)-7, formed by deprotonation of the (S)-S-1-phenylethyl thiocarbamate (S)-10, is configurationally stable at -70 degrees C. Even at elevated temperatures it racemizes only very slowly. It represents the first essentially enantiopure alpha-thiocarbanion derivative and can be utilized in asymmetric synthesis. Most electrophiles (except proton acids) add to (S)-7 with complete stereoinversion. Cleavage of the substitution products leads to practically enantiopure, tertiary 1-phenylalkanethiols.
Collapse
Affiliation(s)
- O Stratmann
- Organisch-Chemisches Institut der Universität Westfälische Wilhelms-Universität Münster, Germany
| | | | | | | | | |
Collapse
|
12
|
Ito H, Sato A, Taguchi T. Formation of a functionalized cyclobutane ring through the reaction of γ,γ-dialkoxyallylic zirconium species with acrylamide. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00470-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
13
|
Barrett AGM, Seefeld MA, White AJP, Williams DJ. Convenient Asymmetric Syntheses of anti-beta-Amino Alcohols. J Org Chem 1996; 61:2677-2685. [PMID: 11667097 DOI: 10.1021/jo9522062] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Condensation of allylborane reagents 9 and 12 with aldehydes gave anti-3-[(diphenylmethylene)amino]-1-alken-4-ols 10 and 13 with high relative and absolute stereocontrol. Subsequent deprotection gave the corresponding free anti-3-amino-1-alken-4-ols 11 and 14. Alternatively, reaction of imines 13a, 13f, and 13g with trifluoromethanesulfonic anhydride and acidic methanol gave, via rearrangement, double inversion, and hydrolysis, the isomeric anti-4-amino-1-alken-3-ols 22, 38a, and 38b in good yield. The stereochemistry of the rearrangement products has been established by a single crystal X-ray study of compound 37 and by chemical correlation.
Collapse
|
14
|
|
15
|
Gennari C, Fioravanzo E, Bernardi A, Vulpetti A. Origins of stereoselectivity in the addition of allyl- and crotylboronates to aldehydes : the development and application of a force field model of the transition state. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85355-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
16
|
Hoffmann RW, Schlapbach A. Stereoselective synthesis of alcohols, XXXVI. Stereoselective generation of homoallyl alcohols having quaternary stereogenic centers. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/jlac.1990199001223] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
17
|
Bubnov YN, �tinger MY, Ignatenko AV. Isoprenylation of carbonyl compounds, esters, and alkoxyacetylenes with 2-dipropylborylmethyl-1,3-butadiene and the synthesis of ipsenol and ipsdienol. Russ Chem Bull 1989. [DOI: 10.1007/bf00957158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
18
|
Hoffmann RW, Lanz JW, Metternich R. Stereoselective syntheses of alcohols, XXVI. Synthesis of 3-methyl-2,6-dideoxyhexoses by addition of an allenyltitanium reagent to aldehydes. European J Org Chem 1988. [DOI: 10.1002/jlac.198819880210] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
19
|
Kabalka GW. Boron: Boranes in organic synthesis. J Organomet Chem 1987. [DOI: 10.1016/0022-328x(87)87185-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
20
|
Landmann B, Hoffmann RW. Diagnostic OH1H-NMR shift differences insyn andanti ß-Hydroxy Ethers. ACTA ACUST UNITED AC 1987. [DOI: 10.1002/cber.19871200313] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
21
|
Hoffmann RW, Landmann B. Stereoselective synthesis of alcohols, XXII.E/Z-selectivity on addition of α-substituted allylboronates to aldehydes. ACTA ACUST UNITED AC 1986. [DOI: 10.1002/cber.19861190324] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|