Synthesis of 8-chloro-benzo[ c ]quinolizin-3-ones as potent and selective inhibitors of human steroid 5α-reductase 1
作者:Antonio Guarna、Ernesto G. Occhiato、Dina Scarpi、Chiara Zorn、Giovanna Danza、Alessandra Comerci、Rosa Mancina、Mario Serio
DOI:10.1016/s0960-894x(99)00698-8
日期:2000.2
The synthesis of a series of differently substituted 8-chloro-benzo[c]quinolizin-3-ones, as potent and selective human steroid 5 alpha-reductase type 1 inhibitors, has been accomplished by a four-step procedure based on the TiCl4-promoted tandem Mannich-Michael cyclization of 2-silyloxy-1,3-butadienes with N-t-Boc iminium ions from quinolin-2-ones. The presence on the benzo[c]quinolizinone nucleus of a methyl group and a double bond at positions 6 and 4-4a, respectively, as in compound Id, gave rise to one of the most potent non-steroidal 5 alpha R-1 inhibitors reported so far (IC50 = 14 nM). (C) 2000 Elsevier Science Ltd. All rights reserved.