A decisive step forward: A one-step fluorination on modified cinchona alkaloids produced a new range of enantiopure fluorinating agents that display high enantioselectivities in electrophilicfluorination. The first enantioselective synthesis of N-protected α-fluorophenylglycine derivatives was achieved with an enantiomeric excess up to 94 % [Eq. (a); R=Et, CN; HMDS=hexamethyldisilazanide].
向前迈出了决定性的一步:在修饰的金鸡纳生物碱上进行一步氟化,产生了一系列新的对映纯氟化剂,它们在亲电氟化中显示出高对映选择性。N-保护的α-氟苯基甘氨酸衍生物的首次对映选择性合成的对映体过量最高为94%。(一种); R = Et,CN;HMDS =六甲基二硅氮杂]。