摘要
On the viewpoints of physical and chemical properties and biological activities, syntheses of a variety of heterocycle-fused azulenes have been repoted.[1] Of them, thiophene-fused azulenes were prepared by using different types of stating materials as follows. Azuleno[2,1-b] thiophenes are readily obtained from the reactions of 2-chloroazulene derivatives with ethyl mercaptoacetate in a few steps in good yield by Matsui[2] and Yamane.[3] On the other hand, the first synthesis of azuleno[1,2-c]thiophenes was accomplished by the reaction of 3-methoxycarbonyl-2H-cyclohepta[b]furan2-one with morpholino enamine of 3-oxotetrahydro-thiophene followed by dehydrogenation in poor yield by Fujimori.……
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2004年第z1期17-18,共2页
Chinese Journal of Organic Chemistry
基金
国家自然科学基金资助项目.