Thiophene systems.<b>4</b>. Selective syntheses of thieno[3,4-<i>b</i>][1,4]- and [1,5]benzodiazepinones
作者:Jeffery B. Press、Corris M. Hofmann、Sidney R. Safir
DOI:10.1002/jhet.5570170701
日期:1980.11
Novel syntheses of thiophene fused tricyclic systems 1 and 2 are reported. The methods use intermediates 4-ethoxy-3-thiopheneamine, 4-ethoxy-3-thiophenecarbonyl aside and 4-ethoxy-3-thiophenecarbonyl chloride to effect selective, high yield syntheses of the target compounds in two steps. These methods allow preparation of thiophenesystems without substitution at the normally reactive C-1 and C-3 positions