乙炔基吡唑的vic取代异羟肟酸杂环化反应制备吡唑并[3,4- c ]和[4,3- c ]吡啶酮的新途径
摘要:
我们在本文中报道了6-取代的吡唑并[4,3 - c ]吡啶-4-酮,6-取代的5-羟基吡唑并[4,3 - c ]吡啶-6-酮,5-取代的吡唑并[3]的合成。 ,4- ç ]吡啶-7-酮和5-取代的6-羟基吡并[3,4- c ^ ]吡啶-7-酮由heterocyclization VIC -acetylenylpyrazol-异羟肟酸铜的影响下(I)盐在二甲基甲酰胺或与丁醇或甲醇中的有机碱混合。
Cyclization of vicinal acetylenic derivatives of pyrazolecarbonamides and benzamides
作者:S. F. Vasilevskii、M. S. Shvartsberg
DOI:10.1007/bf00958258
日期:1990.9
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.
VASILEVSKIJ, S. F.;SHVARTSBERG, M. S., IZV. AN CCCP. CEP. XIM.,(1990) N, S. 2089-2093