Stereoselective synthesis of (S )-MPPG, (S)-MTPG and (S )-(+)-αM4CPG from (R)-4-hydroxyphenylglycine
作者:Dawei Ma、Hongqi Tian
DOI:10.1039/a704704e
日期:——
(R)-4-Hydroxyphenylglycine was protected with a benzyl group and a methyl group was introduced at the α position by using the self-regeneration-of-stereocentre method. After the 4-hydroxy group had been converted into the corresponding trifluoromethanesulfonate (triflate), three palladium-catalyzed reactions were employed to furnish (S)-α-methyl-4-phosphonophenylglycine [(S)-MPPG], (S)-α-methyl-4-(tetrazol-5-yl)phenylglycine [(S)-MTPG] and (S)-4-carboxyphenyl-α-methylglycine [(S)-αM4CPG], a class of new and selective antagonists of metabotropic glutamate receptors.
(R)-4-羟基苯甘氨酸采用苄基保护,并通过立体中心自再生法在δ位引入一个甲基。在 4-羟基转化为相应的三氟甲磺酸盐(三氟酸盐)后,通过三个钯催化反应生成了(S)-δ-甲基-4-膦酰基苯甘氨酸[(S)-MPG]、(S)-δ-甲基-4-(四唑-5-基)苯基甘氨酸[(S)-MTPG]和(S)-4-羧基苯基-δ-甲基甘氨酸[(S)-δM4CPG],这是一类新型的选择性代谢谷氨酸受体拮抗剂。