Synthesis of 1??(1, 1??dimethylethyl)??1H??pyrazole??4??carboxylate ester derivatives
JR Beck, MP Lynch
Index: Beck, James R.; Lynch, Michael P. Journal of Heterocyclic Chemistry, 1987 , vol. 24, p. 693 - 695
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Citation Number: 16
Abstract
Abstract Attempts to prepare ethyl 5-cyano-1-(1, 1-dimethylethyl)-1H-pyrazole-4-carboxylate (7) by the reaction of the corresponding 5-chloro derivative 1b with cyanide ion were unsuccessful. The chloro ester was synthesized from the corresponding amino ester la utilizing nonaqueous diazotization with nitrosyl chloride. An alternate process was developed which allowed the preparation of 7 from the corresponding 5-methyl ester 3 in ...
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