Enantioselective Approach Towards Potential Substance P Antagonists via Hetero-Ene Reaction of Phenylglycine Derivatives
作者:Sabine Laschat、Thomas Fox
DOI:10.1055/s-1997-1201
日期:1997.4
Phenylglycine methyl ester 7 can be converted in a four-step sequence to the aldehyde 11. Lewis acid catalyzed hetero-ene reaction of 11 gave a mixture of 3-hydroxy-2-phenylpiperidines 14a,b with high diastereoselectivity. The major diastereomer 14a was further transformed into 4-isopropyl-3-(2-methoxybenzylamino)-2-phenylpiperidine (19), a compound structurally related to a substance P antagonist, in five steps via azide displacement and reductive amination.
苯甘氨酸甲酯7可以通过四步顺序转化为醛11。路易斯酸催化11的杂烯反应得到具有高非对映选择性的3-羟基-2-苯基哌啶14a,b的混合物。主要非对映异构体 14a 通过叠氮化物置换和还原胺化分五步进一步转化为 4-异丙基-3-(2-甲氧基苄氨基)-2-苯基哌啶 (19),这是一种结构上与 P 物质拮抗剂相关的化合物。