| 摘要 |
A process for the production of a compound of the formula:wherein R1 is hydrogen, alkyl, C1-C16 substituted alkyl, aryl, substituted aryl, aralkyl, substituted aralkyls, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, cyano, carboxy, carboxy esters, carboxamido, N-mono substituted and N,N-disubstituted carboxamido with alkyl, aralkyl and aryl groups; R2 is hydrogen, alkyl C1-C16 substituted alkyl, aryl, substituted aryl, aralkyl, substituted aralkyls, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl; R3 is alkyl C2-C6, branched alkyl, aryl C2-C, substituted aryl and R4 is halogen or H.A condensation reaction is effected between compounds of the formulae:to form a novel compound of the formula:Compound (2) is acylated with a compound of the formula:R3COClto form a novel compound of the formula:Compound (3) is mixed with pyridine and is reacted with thionyl chloride to form compound (4) and compound (4) is dehalogenated to form compound (5).
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