Epothilon derivatives, method for the production and the use thereof as pharmaceuticals
申请人:Schering, AG
公开号:US07001916B1
公开(公告)日:2006-02-21
Disclosed are epothilone compounds of formula I,
which are useful as pharmaceutical compounds for treating, for example, malignant tumors and chronic inflammatory diseases and are useful in anti-angiogenesis therapy.
The present invention relates to a novel nitrosation polymer of the formula
in which X, Y, R
1
, R
2
and R
3
are as defined in claim
1
. The invention also relates to a process for the preparation of the said polymer.
A highly efficient asymmetric cascade reaction between keto esters and alkynyl alcohols and amides is reported. The success of the reaction was attributed to the combination of chiral Lewis acid N,N′‐dioxide nickel(II) catalysis with achiral π‐acid gold(I) catalysis working as an asymmetric relay catalytic system. The corresponding spiroketals and spiroaminals were synthesized in up to 99 % yield,
Enantioselective concomitant creation of vicinal quaternary stereogenic centers via cyclization of alkynols triggered addition of azlactones
作者:Zhi-Yong Han、Rui Guo、Pu-Sheng Wang、Dian-Feng Chen、Han Xiao、Liu-Zhu Gong
DOI:10.1016/j.tetlet.2011.08.123
日期:2011.11
An asymmetric cyclization of alkynols triggered addition of azlactones catalyzed by a combined catalyst system consisting of a chiral gold phosphate and a phosphoric acid produces conformationally restricted amino acid precursors bearing vicinal quaternary stereogenic centers in high levels of stereoselectivity. (C) 2011 Elsevier Ltd. All rights reserved.