Synthesis of a selective estrogen receptor β-modulator via asymmetric phase-transfer catalysis
作者:Mark A. Huffman、Jonathan D. Rosen、Roger N. Farr、Joseph E. Lynch
DOI:10.1016/j.tet.2007.03.074
日期:2007.5
efficient asymmetric synthesis of selective estrogen receptor β-modulator (S)-4-bromo-9a-butyl-8-chloro-6-fluoro-7-hydroxy-1,2,9,9a-tetrahydro-fluoren-3-one was developed. The route features a chemoselective aromatic chlorination reaction, an asymmetric phase-transfer-catalyzed alkylation of an indanone with efficient ee upgrade by racemate crystallization, and a robust bromination reaction using imidazole
选择性雌激素受体β-调节剂(S)-4-溴-9a-丁基-8-氯-6-氟-7-羟基-1,2,9,9a-四氢-芴-3-酮的有效不对称合成发展了。该路线的特点是化学选择性的芳族氯化反应,茚满酮的不对称相转移催化的烷基化以及通过外消旋体结晶的有效ee升级,以及使用咪唑作为原位溴阱的稳健溴化反应,以避免过度反应。由2-氟茴香醚在8个步骤中以34%的产率进行合成,并提供具有> 99.5%ee的材料。