[EN] PROCESS FOR PREPARING TAXOL SIDE CHAIN USING HETEROGENEOUS TRIFUNCTIONAL CATALYST<br/>[FR] PROCEDE DE PREPARATION D'UNE CHAINE LATERALE DE TAXOL AU MOYEN D'UN CATALYSEUR TRIFONCTIONNEL HETEROGENE
申请人:COUNCIL SCIENT IND RES
公开号:WO2004056742A1
公开(公告)日:2004-07-08
The present invention relates to an improved process for the preparation of taxol side chain by synthesizing (2R,3S)-2,3-dihydroxy-3-phenylpropionate with greater than 99% enantioselectivity and devoid of osmium even in crude form in a single pot using a recyclable multifunctional catalysts, conversion of diol obtained without further crystallization into bromoacetate, reaction of bromoacetate with NaN3 in organic solvent followed by deacetylation with to obtain azido alcohol, benzoylation followed by hydrogenation of azido alcohol to obtain the (2R,3S)-(N-)-benzoyl-3-phenylisoserine methyl ester in 67% yield.
本发明涉及一种改进的制备紫杉醇侧链的过程,通过使用可回收的多功能催化剂,在单一反应釜中合成大于99%对映选择性的(2R,3S)-2,3-二羟基-3-苯基丙酸酯,且即使在粗品中也不含锇,将获得的二醇转化为溴乙酸酯,然后在有机溶剂中与NaN3反应,脱乙酰化后得到偶氮醇,再进行苯甲酰化,随后氢化偶氮醇,以得到67%的(2R,3S)-(N-)苯甲酰-3-苯基异丝氨酸甲酯。