Synthesis of chiral α-substituted N-[((2S)-2-hydroxy-2-phenyl)-ethyl]-2-phenylglycine derivatives by diastereocontrolled alkylation of (6 R)-2,3,5,6-tetrahydro-3,6-diaryl-N-[(2′R)-(2′-methyl)phenyl-methyl]-4H-1,4-oxazin-2-ones
作者:Philippe Remuzon、Maxime Soumeillant、Christian Dussy、Daniel Bouzard
DOI:10.1016/s0040-4020(97)10235-6
日期:1997.12
The synthesis of α-substituted N-[((2S)-2-hydroxy-2-phenyl)-ethyl]-2-phenylglycine derivatives is reported. The key step of the sequence is the highly diastereoselective alkylation of (6R)-2,3,5,6-tetrahydro-3,6-diaryl-N-[(2′R)-(2′-methyl)phenylmethyl]-4H-1,4-oxazin-2-ones after deprotonation with t-BuOK. Opening of the resulting oxazinone with ethanolic KOH, followed by hydrogenolysis of the corresponding
报道了α-取代的N -[(((2S)-2-羟基-2-苯基)-乙基] -2-苯基甘氨酸衍生物的合成。序列的关键步骤是的高度非对映烷基化(6 - [R)-2,3,5,6-四氢- 3,6-二芳基- ñ - [(2' - [R ) - (2'-甲基)苯基甲基]用t -BuOK去质子化后的-4 H -1,4-恶嗪-2-酮。还描述了用乙醇KOH打开所得的恶嗪酮,然后氢解相应的N -[(2R)-(2-甲基)苯基甲基]化合物以提供预期的2-苯基甘氨酸衍生物。