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 asymmetricphase-transfer-catalyzed alkylation of an indanone with efficient ee upgrade by racemate crystallization, and a robust bromination reaction using imidazole