[EN] A SEMI-SYNTHETIC PROCESS FOR THE PREPARATION OF N DEBENZOYLPACLITAXEL<br/>[FR] PROCEDE SEMI-SYNTHETIQUE DE PREPARATION DE N- DEBENZOYLPACLITAXEL
申请人:INDENA SPA
公开号:WO2003087077A1
公开(公告)日:2003-10-23
A process for the preparation of N-debenzoylpaclitaxel (I) through esterification of 7-protected baccatin III with a carboxylic acid reactive derivative of general formula (II), and elimination of the ester-protecting groups in acid conditions and in a single step. In formula (II) R1 is aryl or heteroaryl. The compound of formula (I) can be conveniently used for the preparation of paclitaxel and analogues.
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.
A conformation analysis device and analysis method with which discrimination can be achieved even if there is a subtle difference in a conformational structure, a given molecule can be processed in a unified manner, and large-scale computer processing can be performed, and a conformational notation device and notation method with which even in the case where a conformation cannot be uniquely determined if a rule in accordance with the IUPAC Nomenclature is followed, the conformation can be uniquely notated, a given molecule can be processed in a unified manner, and large-scale computer processing can be performed, are provided. In one embodiment of the invention, a processing section receives an input of a chemical structural formula of a compound to be analyzed, puts a predetermined code indicating a dihedral angle to each chemical binding site based on the received chemical structural formula, extracts an encoded conformational notation of interest with respect to a structure capable of uniquely determining a conformation with one conformational notation, and stores the extracted encoded conformational notation in a storage section. Then, the processing section creates a molecular model based on the extracted encoded conformational notation, performs geometry optimization and frequency calculation for the created molecular model, determines a geometry optimized structure and a physical property value of the geometry optimized structure, extracts the encoded conformational notation from the storage section, and performs a homology analysis based on the notation.
Selective protection of the C(7) and C(10) hydroxyl groups in 10-deacetyl baccatin III
作者:Robert A Holton、Zhuming Zhang、Paul A Clarke、Hossain Nadizadeh、D.John Procter
DOI:10.1016/s0040-4039(98)00424-9
日期:1998.5
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.