Tetrahedron Letters p. 6183 - 6184 (1985)
Update date:2022-07-31
Topics:
Grosdemange-Pale, Catherine
Chuche, Josselin
The thermal behaviour of cyclic enaminoesters 1a-d shows a divergence of chemioselectivity as a function of ring size : six and five ring derivatives lead respectively to tetrahydroindoles (3a,b and 4a,b) and oxazole (5c,d).These results may be rationalized by geometrical constraints during the electrocyclisation of intermediate azomethine ylides 5.
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