A General, Highly Anti-Stereoselective Aldolization Method via Camphor-Derived Boryl Enolates
摘要:
Camphor-derived chiral boryl enolates are highly reactive and highly anti-stereoselective enolate synthon systems in aldol addition reactions promoted by a TiCl4 or SnCl4 cocatalyst. More significantly, this high-yield reaction exhibits remarkable generality with respect to the aldehyde nature, as illustrated by the rapid and anti-stereoselective aldolizations with the simple saturated and unsaturated aliphatic aldehydes, and aromatic aldehydes at temperatures as low as -90 degrees C. The enhanced reaction generality and anti stereoselectivity of camphor-derived boryl enolates suggests the importance of the nature of chiral auxiliary architecture in determining the aldol bond construction process. Final nondestructive camphor-based auxiliary removal via hydroperoxide-mediated hydrolysis affords enantiomerically pure anti-beta-hydroxy-alpha-methyl aldol products.
A General, Highly Anti-Stereoselective Aldolization Method via Camphor-Derived Boryl Enolates
摘要:
Camphor-derived chiral boryl enolates are highly reactive and highly anti-stereoselective enolate synthon systems in aldol addition reactions promoted by a TiCl4 or SnCl4 cocatalyst. More significantly, this high-yield reaction exhibits remarkable generality with respect to the aldehyde nature, as illustrated by the rapid and anti-stereoselective aldolizations with the simple saturated and unsaturated aliphatic aldehydes, and aromatic aldehydes at temperatures as low as -90 degrees C. The enhanced reaction generality and anti stereoselectivity of camphor-derived boryl enolates suggests the importance of the nature of chiral auxiliary architecture in determining the aldol bond construction process. Final nondestructive camphor-based auxiliary removal via hydroperoxide-mediated hydrolysis affords enantiomerically pure anti-beta-hydroxy-alpha-methyl aldol products.
A General, Highly Anti-Stereoselective Aldolization Method via Camphor-Derived Boryl Enolates
作者:Ying-Chuan Wang、An-Wei Hung、Chii-Shin Chang、Tu-Hsin Yan
DOI:10.1021/jo9520147
日期:1996.1.1
Camphor-derived chiral boryl enolates are highly reactive and highly anti-stereoselective enolate synthon systems in aldol addition reactions promoted by a TiCl4 or SnCl4 cocatalyst. More significantly, this high-yield reaction exhibits remarkable generality with respect to the aldehyde nature, as illustrated by the rapid and anti-stereoselective aldolizations with the simple saturated and unsaturated aliphatic aldehydes, and aromatic aldehydes at temperatures as low as -90 degrees C. The enhanced reaction generality and anti stereoselectivity of camphor-derived boryl enolates suggests the importance of the nature of chiral auxiliary architecture in determining the aldol bond construction process. Final nondestructive camphor-based auxiliary removal via hydroperoxide-mediated hydrolysis affords enantiomerically pure anti-beta-hydroxy-alpha-methyl aldol products.