Studies on diels-alder cycloadditions of vinylketene dithioacetals

AK Gupta, H Ila, H Junjappa

Index: Gupta, Arun K.; Ila, Hiriyakkanavar; Junjappa, Hiriyakkanavar Tetrahedron, 1989 , vol. 45, # 5 p. 1509 - 1516

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Citation Number: 7

Abstract

The Diels-Alder cycloadditions of the acyclic and cyclic vinylketene dithloacetals 4 prepared from the corresponding oxoketene dithioacetals 2 either by 1, 2-addition of methylmagnesium iodide and subsequent dehydration or by Wlttig reaction, were studied. Thus 4a-e and 4h-i underwent facile [4+ 2] cycloaddition with maleic anhydride followed by elimination of methylmercaptan and subsequent aromatization through dehydrogenation ...