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Pyrrolophenoxathiin dioxides. 1. Synthesis of 3H-pyrrolo[2,3-c]phenoxathiin 11,11-dioxide and 1h-pyrrolo[3,2-b]phenoxathiin 10,10, dioxide by the fischer reaction

โœ Scribed by T. E. Khoshtariya; M. G. Maisuradze; L. M. Tevzadze; L. N. Kurkovskaya; N. N. Suvorov


Publisher
Springer US
Year
1996
Tongue
English
Weight
267 KB
Volume
32
Category
Article
ISSN
0009-3122

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## Abstract 2โ€Methylโ€3__H__โ€indoles 1 cyclize with two equivalents of ethyl malonate **2** to form 4โ€hydroxyโ€11__H__โ€benzo[__b__]pyrano[3,2โ€__f__]indolizinโ€2,5โ€diones 3, whereas 2โ€mefhylโ€2,3โ€dihydroโ€1__H__โ€indoles **9** give under similar conditions regioisomer 8โ€hydroxyโ€5โ€methylโ€4,5โ€dihydroโ€pyrrol