Asymmetric aldol reactions of chiral Ni(II)-complex of glycine with aliphatic aldehydes. Stereodivergent synthesis of syn-(2S)- and syn-(2R)-β-alkylserines
作者:Vadim A Soloshonok、Dimitry V Avilov、Valery P Kukhar'、Vitali I Tararov、Tatiana F Savel'eva、Tatiana D Churkina、Nicolai S Ikonnikov、Konstantin A Kochetkov、Svetlana A Orlova、Alexander P Pysarevsky、Yuri T Struchkov、Nikolai I Raevsky、Yuri N Belokon'
DOI:10.1016/0957-4166(95)00220-j
日期:1995.7
Stereoselectivity of aldol reactions between aliphatic aldehydes and Ni(II)-complex of chiral non-racemic Schiff base of glycine with (S)-o-[N-(N-benzylprolyl)amino]benzophenone (BPB) in the presence of excess of MeONa, has been studied as a function of time, reaction conditions and nature of an aldehyde. Two salient features of the reaction, very high pseudokinetic syn-(2S)-diastereoselectivity, and
脂族醛和Ni之间羟醛缩合反应的立体选择性(II)甘氨酸与(手性非外消旋的席夫碱的-complex小号) - ö - [ ñ - (Ñ -benzylprolyl)氨基]苯甲酮(BPB)在过量的存在下已经研究了MeONa作为时间,反应条件和醛的性质的函数。该反应的两个显着特征,非常高的pseudokinetic顺- (2-小号)-diastereoselectivity,和热力学的依赖性顺式- (2- [R )上的空间位阻的醛侧链-diastereoselectivity,被公开和用于有效的(超过90%的de和ee)不对称合成syn-(2S)和syn-(2 R)-3-烷基取代的丝氨酸。大规模(2– 20 g)对映体纯氨基酸的制备证明了这种不对称方法的合成潜力和可靠性。