Copper-catalysed heteroannulation with alkynes: a general and highly regio-and stereoselective method for the synthesis of (E)-2-(2-arylvinyl) quinazolinones

NG Kundu, G Chaudhuri

Index: Kundu, Nitya G; Chaudhuri, Gopeswar Tetrahedron, 2001 , vol. 57, # 31 p. 6833 - 6842

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Citation Number: 12

Abstract

A highly regio-and stereoselective procedure for the synthesis of 2-substituted-1, 2, 3, 4- tetrahydroquinazolinones through a two-step procedure, eg (i) palladium–copper catalysed C-arylation of terminal alkynes and (ii) copper-catalysed cyclisation of disubstituted alkynes, is described. 2-(N-Alkyl-N-prop-2′-ynyl) amino-N′-p-tolyl benzamides 5a and 5b reacted with aryl iodides 2 in the presence of (Ph3P) 2PdCl2 (2.5 mol%), CuI (5mol%), Et3N ( ...