Catalytic enantioselective reaction. Part 9. 1,2-O-Isopropylidene-5-deoxy-5-N,N-dialkyl (or -N-monoalkyl)amino-α-<scp>D</scp>-xylofuranose derivatives as highly effective chiral catalysts for enantioselective addition of diethylzinc to aliphatic and aromatic aldehydes
作者:Byung Tae Cho、Namdu Kim
DOI:10.1039/p19960002901
日期:——
(or-N-monoalkyl)amino-α-D-xylofuranose derivatives have been prepared form D-xylose and their enantioselectivities as chiral catalysts for the addition of diethylzinc to aldehydes have been examined. Or the chiral catalysts examined, 5-deoxy-1,2-O-isopropylidene-5-morpholino-α-D-xylofuranose provides high enantioselectivity for aromatic and relatively hindered aliphaticaldehydes, and 5-deoxy-5-hexaydroazepinyl-1
一系列新的1,2- ö异亚丙基-5-脱氧-5- Ñ,Ñ二烷基(或- Ñ -monoalkyl)氨基α- d -xylofuranose衍生物已被制备的形式d木糖以及它们的对映选择性手性已经研究了用于将二乙基锌加成到醛中的催化剂。或所研究的手性催化剂5-脱氧-1,2- O-异亚丙基-5-吗啉代-α- D-木呋喃糖为芳香族和相对受阻的脂族醛和5-脱氧-5-六氮杂pin啶基-1,2提供了高对映选择性- ö异亚丙基α- d -xylofuranose为受阻的脂族醛高度有效的。
Enantioselective addition of diethylzinc to aldehydes using γ-aminoalcohols derived from α-D-xylose as new chiral catalysts
作者:Byung Tae Cho、Namdu Kim
DOI:10.1016/s0040-4039(00)73127-3
日期:1994.6
The enantioselective addition of diethylzinc to aldehydes using 1,2-isopropylidene-5-deoxy-5-dialkylamino-α-D-xylofuranoses derived from α-D-xylose as new catalysts provided the corresponding alcohols with 75–96 % ee.
Enantioselective Arylations Catalyzed by Carbohydrate-Based Chiral Amino Alcohols
作者:Ana Dionéia Wouters、Gustavo H. G. Trossini、Hélio A. Stefani、Diogo S. Lüdtke
DOI:10.1002/ejoc.201000113
日期:2010.4
The application of carbohydrate-derived aminoalcohols in the asymmetric arylation of aldehydes by using arylboronic acids as the source of transferable aryl groups is described. The best ligand is derived from the readily available sugar D-xylose and it mediates the addition of a range of arylboronic acids to various aromatic aldehydes in excellent yields and high enantiomeric excesses.