Thermolysis of the glycosylidene-derived O-benzylated diazirine 1 in the presence of N-phenylmaleimide (2), acrylonitrile (3), dimethyl fumarate (4), or dimethyl maleate (5) led in good yields to mixtures of the spirocyclopropanes 6/7, 8–11, 12/13, and 12/13/16/17. The diastereoselectivity depends upon the alkene. The cycloaddition of 1 to 5 is not diastereospecific, in keeping with previous results
在N-苯基马来
酰亚胺(2),
丙烯腈(3),
富马酸二甲酯(4)或
马来酸二甲酯(5)存在下,糖基亚砜衍生的O-苄基重氮1的热解导致螺
环丙烷的混合物6 / 7,8 - 11,12 / 13,和12 / 13 / 16 / 17。非对映选择性取决于烯烃。1至5的环加成与先前的结果一致,不是非对数特定的。的脱保护12,13,16,和17,得到四醇14,15,18,和19分别。