We have modified Gribble’s and Moody’s approaches to ellipticines by introducing substituents into the 3,4-didehydropyridine dienophile to control the key cycloaddition step. A chloro substituent at position 2 improved the yields and the regioselectivities of the cycloadditions and the overall efficiency of the synthesis of ellipticine.
Diels–Alder reactivity of pyrano[3,4-b]indol-3-ones, stable, synthetic equivalents of indole-2,3-quinodimethanes
作者:Christopher J. Moody
DOI:10.1039/c39840000925
日期:——
Pyrano[3,4-b]indol-3-ones (5), syntheticequivalents of indole-2,3-quinodimethanes, undergo Deils–Alder reaction with acetylenes and with benzyne to give carbazoles and benzo[b]carbozoles respectively.
吡喃并[3,4- b ]吲哚-3-酮(5)是吲哚-2,3-喹二甲烷的合成等价物,与乙炔和苯并炔进行Deils-Alder反应,分别得到咔唑和苯并[ b ]咔唑。
Moody, Christopher J., Journal of the Chemical Society. Perkin transactions I, 1985, p. 2505 - 2508
作者:Moody, Christopher J.
DOI:——
日期:——
Pindur, Ulf; Erfanian-Abdoust, Houshang, Liebigs Annalen der Chemie, 1989, p. 227 - 230
作者:Pindur, Ulf、Erfanian-Abdoust, Houshang
DOI:——
日期:——
[4+2]Cycloadditions of Pyrano[3,4-b]indol-3-ones with 1,2-Bis-acceptor Substituted Ethenes: First Evidence for a Non-concerted Diels-Alder Step