and 1, 2-propadienyl sulfides having various substituents at 1-position, affording methylenecyclobutane derivatives with high optical purity. Seven and eight membered carbocycles with chiral side chains are prepared by the ring cleavage reaction and successive cationic cyclization of the chiral methylenecyclobutane derivatives having ω-alkenyl substituents.
催化不对称[2 + 2]环加成反应在3-(2-链烯酰基)-1、3-
恶唑烷丁-2-酮与在1位具有各种取代基的1,2-
丙二烯基
硫醚之间进行,从而提供具有高光学纯度的
亚甲基环丁烷衍
生物。通过环断裂反应和具有ω-烯基取代基的手性
亚甲基环丁烷衍
生物的连续阳离子环化反应制备具有手性侧链的七元和八元碳环。