Stereoselective cross pinacol-type coupling between α,β-unsaturated ketones and aldehydes mediated by chromium(II) and r3SiCl

Kazuhiko Takai; Ryotaro Morita; Chika Toratsu

doi:10.1002/1521-3773(20010316)40:6<1116::AID-ANIE11160>3.0.CO;2-T

Stereoselective cross pinacol-type coupling between α,β-unsaturated ketones and aldehydes mediated by chromium(II) and r₃SiCl

Kazuhiko Takai, Ryotaro Morita, Chika Toratsu

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

Efficient trapping of chromium enolates in the presence of Et₃SiCl gives silyl enol ethers. This trapping changes the course of the reaction between α,β-unsaturated ketones and aldehydes from a sequential aldol-cyclopropanol formation to a cross pinacol-type coupling reaction (Eq. (1); for example, R¹=n-C₈H₁₇,R²=Ph(CH₂) ₂]. The antilsyn ratios of the 1,2-diols depend on the reaction temperature.

Original language	English
Pages (from-to)	1116-1119
Number of pages	4
Journal	Angewandte Chemie - International Edition
Volume	40
Issue number	6
DOIs	https://doi.org/10.1002/1521-3773(20010316)40:6<1116::AID-ANIE11160>3.0.CO;2-T
Publication status	Published - Mar 14 2001

Keywords

Aldehydes
Chromium
Diols
Ketones
Pinacol coupling

ASJC Scopus subject areas

Catalysis
Chemistry(all)

Access to Document

10.1002/1521-3773(20010316)40:6<1116::AID-ANIE11160>3.0.CO;2-T

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title = "Stereoselective cross pinacol-type coupling between α,β-unsaturated ketones and aldehydes mediated by chromium(II) and r3SiCl",

abstract = "Efficient trapping of chromium enolates in the presence of Et3SiCl gives silyl enol ethers. This trapping changes the course of the reaction between α,β-unsaturated ketones and aldehydes from a sequential aldol-cyclopropanol formation to a cross pinacol-type coupling reaction (Eq. (1); for example, R1=n-C8H17,R2=Ph(CH2) 2]. The antilsyn ratios of the 1,2-diols depend on the reaction temperature.",

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AU - Takai, Kazuhiko

AU - Morita, Ryotaro

AU - Toratsu, Chika

PY - 2001/3/14

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AB - Efficient trapping of chromium enolates in the presence of Et3SiCl gives silyl enol ethers. This trapping changes the course of the reaction between α,β-unsaturated ketones and aldehydes from a sequential aldol-cyclopropanol formation to a cross pinacol-type coupling reaction (Eq. (1); for example, R1=n-C8H17,R2=Ph(CH2) 2]. The antilsyn ratios of the 1,2-diols depend on the reaction temperature.

KW - Aldehydes

KW - Chromium

KW - Diols

KW - Ketones

KW - Pinacol coupling

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