Nitrosation of methyl 2-cinnamoylamino-3-dimethylaminopropenoates. Alkyl<i>N</i>-cinnamoyloxalic acid hydroxyimidic amides, intermediates in the synthesis of alkyl 5-styryl-1,2,4-oxadiazole-3-carboxylates
作者:Matej Kmetič、Branko Stanovnik
DOI:10.1002/jhet.5570340610
日期:1997.11
Alkyl 2-(substituted cinnamoylamino)-3-dimethylaminopropenoates 5, prepared either from glycine (1) and substituted cinnamoyl chlorides 2 via oxazol-5(4H)-ones 4, or from cinnamoylglycinate with t-butoxy-bisdimethylaminomethane, were transformed by nitrosation into 5-substituted-1,2,4-oxadiazole-3-carboxylates 8. The formation of alkyl N-cinnamoyloxalic acidhydroxyimidicamides 7, which were isolated