Synthesis of New 2-Vinylation Products of Indole via a Michael-Type Addition Reaction with Dimethyl Acetylenedicarboxylate and Their Diels−Alder Reactivity as Precursors of New Carbazoles
作者:Hüseyin Çavdar、Nurullah Saraçoǧlu
DOI:10.1021/jo061336f
日期:2006.9.1
Reaction of 4,7-dihydroindole and dimethyl acetylenedicarboxylate provided a convenient route to functionalized 2-vinylindoles. Diels−Alder reactions of the 2-vinylindoles with naphthoquinone, p-benzoquinone, 1,2-dicyano-4,5-dichloroquinone, N-phenyltriazolinedione, and tetracyanoethylene were investigated to give [c]annelated 1,2-dihydro, 1,2,3,4-tetrahydro, and fully aromatized carbazoles. The structure
4,7-二氢吲哚与乙酰二羧酸二甲酯的反应为官能化的2-乙烯基吲哚提供了一条方便的途径。研究了2-乙烯基吲哚与萘醌,对苯醌,1,2-二氰基-4,5-二氯醌,N-苯基三唑啉二酮和四氰基乙烯的狄尔斯-阿尔德反应,得到[ c ]退火的1,2-二氢,1 2,3,4-四氢和完全芳香化的咔唑。讨论了2-乙烯基吲哚及其环加合物的结构和形成机理。