Cyclization of vicinal acetylenic derivatives of pyrazolecarbonamides and benzamides
摘要:
Vicinal acetylenic derivatives of pyrazolecarbonamides and benzamides cyclize in alcoholic solution in the presence of KOH with closure of the six- or five-membered lactam ring. The formation of a gamma-lactam (from o-phenylethynylbenzamide) has been noted for the first time. Condensation of vicinal iodopyrazolecarbonamides with copper phenylacetylide gives the pyrazolylacetylenes without concurrent intramolecular cyclization of the product to give the cyclopentadienone ring. We have been unable to repeat the reported similar cyclocondensation of o-iodobenzamide to 3-amino-2-phenylindenone.
DOI:
10.1007/bf00958258
作为产物:
描述:
1,5-dimethyl-1H-pyrazole-4-carboxamide 以75%的产率得到
参考文献:
名称:
VASILEVSKIJ, S. F.;BELOV, A. I.;SHVARTSBERG, M. S., IZV. CO AN CCCP. CEP. XIM. N., 1985, N 15/5, 100-104