Vinylphosphonium salt mediated simple synthesis of 7-oxo-7H-pyrido [1, 2, 3-cd] perimidine derivatives. Dynamic NMR spectroscopic study of prototropic tautomerism …

I Yavari, M Adib, F Jahani-Moghaddam, HR Bijanzadeh

Index: Yavari, Issa; Adib, Mehdi; Jahani-Moghaddam, Fatemeh; Bijanzadeh, Hamid R Tetrahedron, 2002 , vol. 58, # 34 p. 6901 - 6906

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Citation Number: 52

Abstract

The reactive 1: 1 intermediate produced in the reaction between dimethyl acetylenedicarboxylate and triphenylphosphine was trapped by ethyl 1H-perimidine-2- carboxylate to yield 5-ethyl 9-methyl 7-oxo-7H-pyrido [1, 2, 3-cd] perimidine-5, 9- dicarboxylate and 5-ethyl 9-methyl 1-[3-methoxy-1-(methoxycarbonyl)-3-oxo-1-propenyl]-7- oxo-7H-pyrido [1, 2, 3-cd] perimidine-5, 9-dicarboxylate in nearly 7: 1 ratio and overall ...