Remarkable effect of water in a regioselective lithiation of 5-(tert-butoxycarbonyl)-7-methoxy-1-methyl-1,3,4,5-tetrahydropyrrolo[4,3,2-de]quinoline
作者:Yoshihiro Moro-oka、Satoru Iwakiri、Tsutomu Fukuda、Masatomo Iwao
DOI:10.1016/s0040-4039(00)00822-4
日期:2000.7
5-(tert-Butoxycarbonyl)-7-methoxy-1-methyl-1,3,4,5-tetrahydropyrrolo[4,3,2-de]quinoline (1b) was lithiated regioselectively at C-6 with sec-BuLi (3.0 equiv.) in the presence of water (1.0 equiv.) in ether at -78 degrees C. Under conventional conditions, 1b was lithiated non-regioselectively at the C-6, C-8 and C-2 positions. (C) 2000 Elsevier Science Ltd. All rights reserved.