Synthesis of cyclopentathiophenacetic acid derivatives. Reactivity of methyl 6-oxo-4,5-dihydro-6<i>H</i>-cyclopenta[<i>b</i>]thiophen-4-acetate
作者:Abderrahim Jilale、Pierre Netchitaïlo、Bernard Decroix、Daniel Vegh
DOI:10.1002/jhet.5570300406
日期:1993.7
Oxodihydrocyclopentathiophenacetic acids 4, 5 and 6 were synthesized from suitable 2- or 3-formylthiophenes. Reactivity of the carbonyl group or the carboxylic group of these bicyclic systems was investigated. The Beckmann rearrangement of methyl 6-oximino4,5-dihydro-6H-cyclopenta[b]thiophen-4-acetate 12 is an interesting route to methyl 7-oxo-4,5,6,7-tetrahydrothieno[2,3-c]pyridin-4-acetate (13).
Oxodihydrocyclopentathiophenacetic酸4,5和6是从合适的2-或3- formylthiophenes合成。研究了这些双环系统的羰基或羧基的反应性。甲基6-氧亚氨基4,5-二氢-6 H-环戊[ b ]噻吩-4-乙酸酯12的贝克曼重排是获得甲基7-氧代-4,5,6,7-四氢噻吩并[2,3- ]的有趣途径c ] -4-乙酸吡啶酯(13)。