Catalytic enantioselective synthesis of the second generation histamine antagonist cetirizine hydrochloride
作者:E.J. Corey、Christopher J. Helal
DOI:10.1016/0040-4039(96)00964-1
日期:1996.7
synthesis of cetirizine hydrochloride (1) has been developed using the highly stereospecific chiral oxazaborolidine (CBS) reduction of 4[η6-chromium tricarbonylbenzoyl]chlorobenzene to establish the benzhydryl stereocenter. The chromium tricarbonyl unit also served as stereocontroller to allow the stereospecific displacement of hydroxyl by amino at the benzylic stereocenter, as outlined in Scheme 1.
西替利嗪盐酸盐(第一对映选择性合成1)一直使用高立体有择的手性恶唑硼烷(CBS)减少4 [开发η 6 -铬tricarbonylbenzoyl]氯苯建立二苯甲基立构。如方案1所述,三羰基铬单元还可以用作立体调节剂,以使氨基苄基立体中心的羟基发生立体有规置换。