Tetrahedron p. 5427 - 5440 (1996)
Update date:2022-08-05
Topics:
Kollenz
Penn
Theuer
Fabian
Abd El-Nabi
Zhang, Xiong
Peters
Peters
Von Schnering
The heterocyclic 2,3-diones 1 and 11 together with Lawesson reagent (LR) afford novel isoindigoide dyes 4 and 12, respectively. 4a can thermally be isomerized into the pyrano[4,3-c]pyrane 6, accompanied by a significant hypsochronic shift which was corroborated by quantum chemical calculations. The phosphoranylidene derivative 13 was obtained via Wittig reaction of 1. All structural assignments were based on X-ray studies of 4a and 13.
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Doi:10.1016/0022-328X(94)88008-5
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