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Structure of a pyrano[2,3-b]indolizine

โœ Scribed by Kakehi, A. ;Kitajima, K. ;Ito, S. ;Takusagawa, N.

Book ID
114509984
Publisher
International Union of Crystallography
Year
1993
Tongue
English
Weight
308 KB
Volume
49
Category
Article
ISSN
0108-2701

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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