Benzo[b]thiophene as a template for substituted quinolines and tetrahydroquinolines
摘要:
An original methodology starting from 3-aroyl-2-(2'-nitro-4'-methoxyphenyl)-benzo[b]thiophene allows the synthesis of unusual fused heterocycles. Direct hydrogenation with nickel catalysts followed by desulfurisation led to 2,3-diarylquinolines or 2,3-diaryltetrahydroquinolines. (c) 2005 Published by Elsevier Ltd.
Benzo[b]thiophene as a template for substituted quinolines and tetrahydroquinolines
摘要:
An original methodology starting from 3-aroyl-2-(2'-nitro-4'-methoxyphenyl)-benzo[b]thiophene allows the synthesis of unusual fused heterocycles. Direct hydrogenation with nickel catalysts followed by desulfurisation led to 2,3-diarylquinolines or 2,3-diaryltetrahydroquinolines. (c) 2005 Published by Elsevier Ltd.
A series of 6-arylbenzothieno[3,2-c] quinolines were synthesised in three steps from benzo[b] thiophene. After a selective Heck-type coupling of benzo[b] thiophene with different o-nitroaryl bromides to obtain 2-(o-nitroaryl) benzo[b] thiophenes, corresponding 2-(benzo[ b] thiophen-2-yl) anilines were involved in a Pictet-Spengler reaction to form the quinoline cycle. (C) 2007 Published by Elsevier Ltd.