Organocatalytic Nucleophilic Addition of Hydrazones to Imines: Synthesis of Enantioenriched Vicinal Diamines
作者:Yang Wang、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201702295
日期:2017.5.8
catalytic amount of chiral phosphoric acid, nucleophilic addition of N‐monosubstituted hydrazones to N‐Boc imines affords differentially protected vicinal diamines in the form of β‐amino N,N′‐dialkyldiazenes in excellent yields with high chemo‐, diastereo‐, and enantioselectivity. This catalytic asymmetric aza‐Mannich reaction represents the first example in which N‐alkyl hydrazones serve as α‐azo carbanion
在催化量的手性磷酸的存在下,N-单取代的azo原子向N- Boc亚胺的亲核加成,可得到β-氨基N,N'-二烷基二氮烯形式的差异保护的邻位二胺,化学收率高,非对映和对映选择性。这种催化的不对称氮杂曼尼希反应代表了第一个例子,其中N-烷基用作α-偶氮碳负当量,为邻二胺提供两个连续的立体中心的控制。加合物易于转化为单保护的或游离的二胺及其衍生物。