Enantioselective Synthesis of <i>trans</i>-4-Methylpipecolic Acid
作者:Carlos Alegret、Ferran Santacana、Antoni Riera
DOI:10.1021/jo071220z
日期:2007.9.1
[GRAPHICS]An asymmetric synthesis for the preparation of both enantiomers of trans-methylpipecolic acids is described. It is based on Sharpless epoxidation as a chirality source, regioselective ring opening with allylamine, and ring-closing metathesis to construct the piperidine ring. The stereogenic center at C-4 is set by stereoselective hydrogenation that is directed by the alcohol functionality of an intermediate and proceeds with good diastereomeric control (trans/cis 16/1). Crystallization of the Boc-protected amino acid afforded the target products with excellent chemical (98% de) and enantiomeric purity (99% ee).
Hemiasterlin derivatives and uses thereof in the treatment of cancer
申请人:Kowalczyk J. James
公开号:US20080051434A1
公开(公告)日:2008-02-28
The present invention provides compounds having formula (I):
and additionally provides methods for the synthesis thereof and methods for the use thereof in the treatment of cancer, wherein R
1
-R
7
, X
1
, X
2
, R, Q, and n are as defined herein.
HEMIASTERLIN DERIVATIVES AND USES THEREOF IN THE TREATMENT OF CANCER
申请人:KOWALCZYK James J.
公开号:US20100063095A1
公开(公告)日:2010-03-11
The present invention provides compounds having formula (I):
and additionally provides methods for the synthesis thereof and methods for the use thereof in the treatment of cancer, wherein R
1
-R
7
, X
1
, X
2
, R, Q, and n are as defined herein.