The organocatalytic α-alkylation of vinylogous carbonyl compounds to hydroxynitroolefins for the synthesis of hemiacetals was realized with excellent enantioselectivities and in high yields. High diastereoselectivity (up to >20:1) has been accomplished with the addition of Et3N. The α- and γ-alkylation of vinylogous ketone against nitroolefins displayed high but opposite facial selectivities. Transformation
以优异的对映选择性和高产率实现了用于合成
半缩醛的
乙烯基羰基化合物的有机催化 α-烷基化反应生成羟基硝基烯烃。通过添加 Et 3 N实现了高非对映选择性(高达 >20:1)。
乙烯基酮对硝基烯烃的 α-和 γ-烷基化显示出高但相反的表面选择性。已证明
半缩醛产物转化为其他
多环化合物,包括euroticin B 类似物。