An Amino Alcohol Ligand for Highly Enantioselective Addition of Organozinc Reagents to Aldehydes: Serendipity Rules
作者:William A. Nugent
DOI:10.1021/ol0259488
日期:2002.6.1
bis(2-bromoethyl) ether. Subsequent hydrogenation over 5% Rh on alumina in the presence of morpholine unexpectedly stops at the hexahydro derivative 4. Amino alcohol 4 promotes the enantioselectiveaddition of diethylzinc to aldehydes at room temperature in up to 99% enantiomeric excess.
Enantioselective addition of diethylzinc to α-branched aldehydes
作者:Jahyo Kang、Jun Won Lee、Joo In Kim
DOI:10.1039/c39940002009
日期:——
Reaction of diethylzinc with α-branched aldehydes in the presence of a catalytic amount of (1R,2S)-(â)-1-phenyl-2-piperidinopropane-1-thiol 1 provided the corresponding secondary alcohols in almost 100% enantiomeric excess.
The invention concerns compounds of Formula (I)
or pharmaceutically-acceptable salts thereof, wherein R
1
and R
2
have any of the meanings defined hereinbefore in the description; processes for their preparation, pharmaceutical compositions containing them and their use in the treatment of cell proliferative disorders.
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。
The asymmetric epoxidation of -butyl substituted allylic alcohols
作者:M.J. Schweiter、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)98832-4
日期:1985.1
The response of the asymmetric epoxidation reaction to steric bulk in the substrate is tested by use of allylic alcohols with -butyl groups at each one of four possible positions.