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Liu Y, Zhu Z, Zhang Y, Zhang Y, Liu S, Shen X. Stereoselective Synthesis of Silyl Enol Ethers with Acylsilanes and α,β-Unsaturated Ketones. Org Lett 2024. [PMID: 38975934 DOI: 10.1021/acs.orglett.4c01782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2024]
Abstract
Acylsilanes are emerging bench-stable reagents for the generation of electron-rich oxycarbenes that are difficult to access with unstable diazo compounds. Herein, we report a siloxycarbene-mediated stereoselective synthesis of silyl enol ethers through visible-light-induced intermolecular reactions between acylsilanes and α,β-unsaturated ketones. Both the solvent and low temperature are important for the success of the reaction. This approach features atomic economics, exclusive stereocontrol, and broad substrate scope. The synthetic potential of this methodology is demonstrated by gram-scale reaction and various downstream transformations including that requiring configuration purity of the silyl enol ethers.
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Affiliation(s)
- Ying Liu
- The Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Zhihong Zhu
- The Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Yunxiao Zhang
- The Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Yizhi Zhang
- The Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Shanshan Liu
- The Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
| | - Xiao Shen
- The Institute for Advanced Studies, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University, 299 Bayi Road, Wuhan, Hubei 430072, China
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2
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Amatov T, Tsuji N, Maji R, Schreyer L, Zhou H, Leutzsch M, List B. Confinement-Controlled, Either syn- or anti-Selective Catalytic Asymmetric Mukaiyama Aldolizations of Propionaldehyde Enolsilanes. J Am Chem Soc 2021; 143:14475-14481. [PMID: 34436899 PMCID: PMC8447262 DOI: 10.1021/jacs.1c07447] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
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Protected aldols
(i.e., true aldols derived from aldehydes) with
either syn- or anti- stereochemistry
are versatile intermediates in many oligopropionate syntheses. Traditional
stereoselective approaches to such aldols typically require several
nonstrategic operations. Here we report two highly enantioselective
and diastereoselective catalytic Mukaiyama aldol reactions of the
TBS- or TES- enolsilanes of propionaldehyde with aromatic aldehydes.
Our reactions directly deliver valuable silyl protected propionaldehyde
aldols in a catalyst controlled manner, either as syn- or anti- isomer. We have identified a privileged
IDPi catalyst motif that is tailored for controlling these aldolizations
with exceptional selectivities. We demonstrate how a single atom modification
in the inner core of the IDPi catalyst, replacing a CF3-group with a CF2H-group, leads to a dramatic switch in
enantiofacial differentiation of the aldehyde. The origin of this
remarkable effect was attributed to tightening of the catalytic cavity
via unconventional C–H hydrogen bonding of the CF2H group.
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Affiliation(s)
- Tynchtyk Amatov
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Nobuya Tsuji
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan
| | - Rajat Maji
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Lucas Schreyer
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Hui Zhou
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Benjamin List
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany.,Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan
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3
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Wang J, Zheng XZ, Xiao JA, Chen K, Xiang HY, Chen XQ, Yang H. Enantioselectivity-Switchable Organocatalytic [4 + 2]-Annulation to Access the Spirooxindole–Norcamphor Scaffold. Org Lett 2021; 23:963-968. [DOI: 10.1021/acs.orglett.0c04164] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jing Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Xian-Zhou Zheng
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Jun-An Xiao
- Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, Nanning Normal University, Nanning 530001, China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Hao-Yue Xiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Xiao-Qing Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
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4
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Vargas EL, Velázquez JA, Rodrigo E, Reinecke H, Rodríguez-Hernández J, Fernández-Mayoralas A, Gallardo A, Cid MB. p Ka Modulation of Pyrrolidine-Based Catalytic Polymers Used for the Preparation of Glycosyl Hydrazides at Physiological pH and Temperature. ACS APPLIED BIO MATERIALS 2020; 3:1955-1967. [PMID: 35025318 DOI: 10.1021/acsabm.9b01123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Inspired by the ability of enzymes to use the surrounding hydrophobic and/or polarizable groups to modulate the pKa of a given amino acid, we designed a series of soluble polymers able to decrease the basicity of pyrrolidine (from 11.2 to 8.6 pKa units), which clearly increases its aminocatalytic activity at physiological pH in C═N bond formation reactions via ion iminium activation. Other parameters such as charge density, hydrophobic/hydrophilic balance, and aggregation state have been studied as important factors in the catalytic activity of the polymers for a given substrate. To demonstrate the utility of our approach, an optimal pyrrolidine-based catalytic polymer has been used for the formation of C-N bonds between hydrazides and free sugars as the model system for the preparation of glycoconjugates.
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Affiliation(s)
- Emily L Vargas
- Department of Organic Chemistry, Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
| | - J Antonio Velázquez
- Department of Organic Chemistry, Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
| | - Eduardo Rodrigo
- Department of Organic Chemistry, Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
| | - Helmut Reinecke
- Instituto de Ciencia y Tecnologı́a de Polı́meros (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - Juan Rodríguez-Hernández
- Instituto de Ciencia y Tecnologı́a de Polı́meros (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | | | - Alberto Gallardo
- Instituto de Ciencia y Tecnologı́a de Polı́meros (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - María Belén Cid
- Department of Organic Chemistry, Universidad Autónoma de Madrid Cantoblanco, 28049 Madrid, Spain
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5
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Vega-Peñaloza A, Paria S, Bonchio M, Dell’Amico L, Companyó X. Profiling the Privileges of Pyrrolidine-Based Catalysts in Asymmetric Synthesis: From Polar to Light-Driven Radical Chemistry. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01556] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Alberto Vega-Peñaloza
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Suva Paria
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Marcella Bonchio
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Luca Dell’Amico
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Xavier Companyó
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
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