R. Angell et al., NOVEL CHIRAL TEMPLATES FOR 1,3-OXAZOLIUM-4-OLATE (ISOMUNCHNONE) CYCLOADDITIONS - (5R)-PHENYLOXAZIN-2,3-DIONE AND (5S)-PHENYLOXAZIN-2,3-DIONE, Tetrahedron letters, 38(17), 1997, pp. 3107-3110
Cycloadducts (4-10) were synthesised From isomunchnone derivatives of
(5R)- and (SS)-phenyloxazin-2,3-dione by rhodium(II)-catalysed decompo
sition. High endo/exo-selectivities for additions to carbon-carbon dip
olarophiles were observed. (C) 1997 Elsevier Science Ltd.