characteristic Lewis acid catalyst in the regio- and stereoselective rearrangement of epoxides to aldehydes. This Cr(TPP)OTf-catalyzed reaction is an operationally simple and especially convenient method for synthesizing optically active beta-siloxy aldehydes from 2,3-epoxy silyl ethers which are readily available in enantiomerically enriched forms by the Sharpless epoxidation of allylic alcohols followed
Rearrangement of trisubstituted epoxides has been effected under the influence of various Lewis acids. Among these, methylaluminum bis(4-bromo-2,6-di-tert-butylphenoxide) (MABR) can be selectively rearranged from trisubstituted epoxides to aldehydes, while antimony pentafluoride is employable for selective rearrangement to ketones under mild conditions.
Villieras, J.; Kirschleger, B.; Tarhouni, R., Bulletin de la Societe Chimique de France, 1986, # 3, p. 470 - 478
作者:Villieras, J.、Kirschleger, B.、Tarhouni, R.、Rambaud, M.
DOI:——
日期:——
Maruoka Keiji, Murase Noriaki, Bureau Ronan, Ooi Takashi, Yamamoto Hisash+, Tetrahedron, 50 (1994) N 12, S 3663-3672
作者:Maruoka Keiji, Murase Noriaki, Bureau Ronan, Ooi Takashi, Yamamoto Hisash+