Enantioselective route to .gamma.-butyrolactones: chiral auxiliary mediated amide alkylation and iodolactonization
摘要:
A number of chiral, gamma, delta-unsaturated amides (1 and 2) have been prepared and their subsequent alkylation and iodolactonization to gamma-butyrolactones (3) investigated.
Enantioselective route to .gamma.-butyrolactones: chiral auxiliary mediated amide alkylation and iodolactonization
摘要:
A number of chiral, gamma, delta-unsaturated amides (1 and 2) have been prepared and their subsequent alkylation and iodolactonization to gamma-butyrolactones (3) investigated.
Alkylations of chiral amide enolates derived from (ℓ)-prolinol have been shown to yield versatile hydroxy-amides in high diastereomeric purity. Their use in the preparation of optically active carboxylic acids is described.
Sonic Hedgehog modulators and methods of use thereof are provided for.
提供了刺猬Sonic Hedgehog调节剂及其使用方法。
Preparation of Nonracemic 3,5-Disubstituted-.gamma.-butyrolactones: An Effective Sequent Auxiliary for Amide Alkylation and Iodolactonization
作者:Hongsik Moon、Shawn W. E. Eisenberg、Mark E. Wilson、Neil E. Schore、Mark J. Kurth
DOI:10.1021/jo00101a002
日期:1994.11
The effective dual use of a chiral auxiliary in two sequential steps is reported; this sequent auxiliary mediates diastereoselective C-C bond formation in the first step and mediates diastereoselective heterocyclization in the second step.
EVANS, DAVID A.;DOW, ROBERT L.;SHIH, THOMAS L.;TAKACS, JAMES M.;ZAHLER, R+, J. AMER. CHEM. SOC., 112,(1990) N3, C. 5290-5313
作者:EVANS, DAVID A.、DOW, ROBERT L.、SHIH, THOMAS L.、TAKACS, JAMES M.、ZAHLER, R+
DOI:——
日期:——
NAJDI, SAMIR;REICHLIN, DANIEL;KURTH, MARK J., J. ORG. CHEM., 55,(1990) N6, C. 6241-6244