Stereoselectivity in the sigmatropic rearrangement of eight-and nine-membered cyclic allylsulfonium ylides. synthesis of vinyl-substituted butyro-and valerolactones
F Kido, SC Sinha, T Abiko, M Watanabe, A Yoshikoshi
The rhodium (II) acetate-catalyzed [2, 3] sigma-tropic rearrangement of the diazo malonates of (z)-4-phen-ylthio-2-buten-l-ol derivatives 6 afforded vinyl-substituted butyrolactones 10 in a highly stereoselective manner, while the rearrangement of the diazo malonates of homologues,(z)-5-phenylthio-3-penten-1-ol derivatives 9, yielded vinyl-substituted valerolactones 13 and 14 in the predominance of the formers. A stereochemically fixed ...
