T. Fukuda et al., Catalytic and asymmetric [2,3]sigmatropic rearrangement: Co(III)-salen catalyzed S-ylide formation from allyl aryl sulfides and their rearrangement, TETRAHEDRON, 55(3), 1999, pp. 649-664
Reaction of allyl aryl sulfides and a-diazoacetic acid esters in the presen
ce of optically active Co(III)-salen complex (8-Br) provided 3-substituted
2-arylthio-4-pentenoic acid esters stereoselectively py way of enantioselec
tive S-ylide formation and subsequent diastereoselective [2,3]sigmatropic r
earrangement. For example, the reaction of cinnamyl phenyl sulfide and (-)-
menthyl alpha-diazoacetate provided (-)-menthyl (2R,3S)-2-phenylthio-3-phen
yl-4-pentenoate of 74% de preferentially. (C) 1998 Elsevier Science Ltd. Al
l rights reserved.