Selective protection of the C(7) and C(10) hydroxyl groups in 10-deacetyl baccatin III
摘要:
New protocols for the selective protection of the C(7) and C(10) hydroxyl groups of 10-deacetyl baccatin III are described, leading to more efficient semisyntheses of taxol and taxol analogs. The C(10) hydroxyl group of 10-DAB can be highly selectively acylated or silylated, and subsequent selective protection of the C(7) hydroxyl group then becomes straightforward. (C) 1998 Elsevier Science Ltd. All rights reserved.
A process is described for converting the C(7) hydroxy group of a 10-acyloxy-7-hydroxytaxane to an acetal or ketal, the process comprising treating the 10-acyloxy-7-hydroxytaxane with a ketalizing agent in the presence of an acid catalyst to form a C(7) ketalized taxane of the formula
or
wherein either X31 or X32 represents the 10-acyloxy-7-hydroxytaxane moiety and the other of X31 and X32 as well as X33 and X34 are independently hydrocarbyl, substituted hydrocarbyl or heteroaryl moieties. Taxanes having a ketalized C(7) hydroxy group are also described.
[EN] C(10) ETHYL ESTER AND C(10) CYCLOPROPYL ESTER SUBSTITUTED TAXANES<br/>[FR] TAXANES SUBSTITUÉS PAR UN ESTER ÉTHYLIQUE EN C(10) ET UN ESTER CYCLOPROPYLIQUE EN C(10)
申请人:UNIV FLORIDA STATE RES FOUND
公开号:WO2009145981A1
公开(公告)日:2009-12-03
Taxanes having an ethyl ester or cyclopropyl ester substituent at C(10), a keto substituent at C(9), a hydroxy substituent at C(7), a thienyl substituent at C(3') and a cyclobutyloxycarbamate or cyclopentyloxycarbamate substituent at C(3'), pharmaceutical compositions comprising such taxanes, methods of treatment and administration, and methods of preparation of medicaments comprising the taxanes.
A simple synthesis of 10-deacetoxytaxol derivatives
作者:Robert A. Holton、Carmen Somoza、Ki-Byung Chai
DOI:10.1016/0040-4039(94)88314-9
日期:1994.3
The C-10 oxygen substituent can be reductively removed in high yield by reaction of taxol, baccatin III, or 10-deacetylbaccatin III with samarium diiodide. This reaction pathway can be completely shut down by protection of the C-7 hydroxyl group of baccatin III as the triethylsilyl ether.
Taxanes having an alkyl substituted side-chain and pharmaceutical compositions containing them
申请人:Florida State University
公开号:US06335362B1
公开(公告)日:2002-01-01
Taxane derivatives having an alkyl substituted C13 side chain.
具有烷基取代的C13侧链的紫杉烷衍生物。
PROCESS FOR THE PREPARATION OF CABAZITAXEL AND ITS INTERMEDIATES
申请人:INTAS PHARMACEUTICALS LIMITED
公开号:US20150307468A1
公开(公告)日:2015-10-29
The present invention relates to a novel process for preparation of cabazitaxel (I) starting from 10-Deacetyl baccatin or derivative that involves methylation of 7, 10 —OH groups. Also provided is a novel process using chiral bis-lactam linker for the synthesis of cabazitaxel.