trimeric cinchona alkaloid, the quaternary ammonium salt, a,a',a"-tris[O(9)-allylcinchonidinium-(4-methylphenoxymethyl)]benzene trichloride, has been synthesized and used as an efficient phase-transfer catalyst in asymmetric alkylation of N-(diphenylmethylene)glycine tert-butyl ester with very good yield (up to 97%) and high enantioselectivity (up to 98%).
合成了一种新的三聚
金鸡纳
生物碱季
铵盐 a,a',a"-三[O(9)-allylcinchonidinium-(4-methylphenoxymethyl)]苯三
氯化物,并用作高效相转移催化剂N-(二苯基亚甲基)
甘氨酸叔丁酯的不对称烷基化具有非常好的收率(高达 97%)和高对映选择性(高达 98%)。