Enantioselective Synthesis of α-Methyl Carboxylic Acids from Readily Available Starting Materials via Chemoenzymatic Dynamic Kinetic Resolution
作者:Lisa K. Thalén、Anna Sumic、Krisztián Bogár、Jakob Norinder、Andreas K. Å. Persson、Jan-E. Bäckvall
DOI:10.1021/jo1011653
日期:2010.10.15
enantioselective method for the synthesis of α-methyl carboxylic acids starting from trans-cinnamaldehyde, a readily available and inexpensive compound, has been developed. Allylic alcohol 1 was obtained via a standard Grignard addition to trans-cinnamaldehyde. Dynamic kinetic resolution was applied to allylic alcohol 1 utilizing a ruthenium catalyst and either an (R)-selective lipase or an (S)-selective protease
Dynamic kinetic resolution of allylic alcohols to allylic acetates followed by copper-catalyzed allylic substitution gave alkenes in high yields and high optical purity. Subsequent oxidative C-C double bond cleavage afforded pharmaceutically important alpha-methyl substituted carboxylic acids in high ee.
Alkylation of allylic derivatives. 9. On the stereochemistry of alkylation of acyclic allylic alcohols by the Murahashi method
作者:Harlan L. Goering、Chung Chyi Tseng
DOI:10.1021/jo00210a007
日期:1985.5
GOERING, H. L.;TSENG, CHUNG, CHYI, J. ORG. CHEM., 1985, 50, N 10, 1597-1599
作者:GOERING, H. L.、TSENG, CHUNG, CHYI
DOI:——
日期:——
TSENG CHUNG CHYI; YEN SHYH-JAUNG; GOERING H. L., J. ORG. CHEM., 51,(1986) N 15, 2892-2895
作者:TSENG CHUNG CHYI、 YEN SHYH-JAUNG、 GOERING H. L.