We present herein simple primary-tertiary diamine-Bronsted acid conjugates that catalyze both syn- and anti-adol reactions of dihydroxyacetones (DHAs) with high diastereoselectivities and enantioselectivities. This type of organocatalysts functionally mimics all four DHA aldolases, namely L-fuculose-1-phosphate aldolase, D-tagatose-1,6-diphosphate aldolase, D-fructose-1,6-diphosphate aldolase, and L-rhamnulose-1-phosphate aldolase.
Organocatalytic Asymmetric<i>syn</i>-Aldol Reactions of Aldehydes with Long-Chain Aliphatic Ketones on Water and with Dihydroxyacetone in Organic Solvents
作者:Ming-Kui Zhu、Xiao-Ying Xu、Liu-Zhu Gong
DOI:10.1002/adsc.200800105
日期:2008.6.9
syn-aldol reaction of aliphatic ketones with aromatic aldehydes catalyzed by a primary amino acid-based organocatalyst afforded the syn-aldol adducts in high yields with excellent diastereo- and enantioselectivities (up to > 20/1 dr, >99% ee), and a highly enantioselective syn-aldol reaction of dihydroxyacetone with a variety of aldehydes in THF proceeded with 14/1 to >20/1 dr and 92 to >99% ee. Water not