Enantioselective Synthesis of Primary 1-(Aryl)alkylamines by Nucleophilic 1,2-Addition of Organolithium Reagents to Hydroxyoxime Ethers and Application to Asymmetric Synthesis of G-Protein-Coupled Receptor Ligands
作者:Masakazu Atobe、Naoki Yamazaki、Chihiro Kibayashi
DOI:10.1021/jo049517+
日期:2004.8.1
previously used as an efficient chiral auxiliary for the synthesis of natural products in this laboratory. The synthetic utility of this methodology involving diastereoselective methyl addition was demonstrated by further application to the asymmetric synthesis of a new type of calcium receptor agonist (calcimimetics), (R)-(+)-NPS R-568 and its thio analogue. Furthermore, diastereoselective vinylation was accomplished
(É)-Arylaldehyde肟醚轴承(1个小号)-2-羟基-1-苯乙基或(2 - [R)-1-羟基-2-苯乙基作为手性助剂,无论是从一个单一的前体衍生的,甲基(ř)-扁桃酸酯,通过六元螯合物与有机锂试剂进行亲核加成,分别得到非对映体富集的(R)-和(S)-加合物,在通过还原性N-O键裂解手性辅助除去后,导致对应的(R)-和(S)-1-(芳基)乙胺。这种使用甲基锂的有机锂加成方案以对映发散的方式应用于1-(2-羟苯基)乙胺的两种对映体的制备,该对映体先前已在该实验室中用作合成天然产物的有效手性助剂。通过进一步应用于新型钙受体激动剂(拟钙剂)的不对称合成,证明了该方法涉及非对映选择性甲基加成的合成效用(R)-(+)-NPS R-568及其硫代类似物。此外,通过使用乙烯基锂应用基于羟基肟醚的方案完成了非对映选择性乙烯基化,从而开发了NK-1受体拮抗剂(+)-CP-99,994和(+)-CP-122