Padmanabhan, S.; Seshadri, S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1985, vol. 24, p. 1111 - 1114
作者:Padmanabhan, S.、Seshadri, S.
DOI:——
日期:——
PADMANABHAN S.; SESHADRI S., INDIAN J. CHEM., 24,(1985) N 11, 1111-1114
作者:PADMANABHAN S.、 SESHADRI S.
DOI:——
日期:——
Heteroaromatic Annulation of 2-Methyl/2-Cyanomethylbenzimidazole Dianions with <i>α</i>-Oxoketene Dithioacetals: A Highly Regioselective Synthetic Protocol for 1,2- and 2,3-Substituted/Annulated Pyrido[1,2-<i>a</i>]benzimidazoles
作者:Kausik Panda、J. R. Suresh、H. Ila、H. Junjappa
DOI:10.1021/jo026786w
日期:2003.5.1
involving [3 + 3] cyclocondensation of the dianions generated from 2-methyl (2A) and 2-cyanomethyl (3A) benzimidazoles with a variety of alpha-oxoketene dithioacetals has been reported. Thus the dianion 2A derived from 2-methylbenzimidazole has been shown to undergo regioselective 1,2-addition with various alpha-oxoketene dithioacetals derived fromacyclic (4a-d) and cyclic ketones (13a,b, 20, 29 and