A Chiral, Oxidatively Cleavable Auxiliary in Conjugate Additions of Lithium Amides. Preparation of Enantiomerically Pure β-Amino Acid Derivatives
作者:Joachim Podlech
DOI:10.1080/00397910008087223
日期:2000.4
Abstract Addition of enantiomerically pure 4-methoxyphenethyl-substituted lithium amides to α,β-unsaturated esters leads to β-amino acid derivatives 4-7 with selectivities > 95: 5. The auxiliary can be cleaved by oxidation with cerium(IV) ammonium nitrate (CAN) and subsequent hydrolysis of the resulting mixture of imines.
摘要 对映体纯的 4-甲氧基苯乙基取代的氨基锂与 α,β-不饱和酯的加成产生选择性 > 95: 5 的 β-氨基酸衍生物 4-7。该助剂可通过硝酸铈 (IV) 铵氧化裂解(CAN) 并随后水解所得的亚胺混合物。