tert-butyl ((2R,4R)-2-methyltetrahydro-2H-pyran-4-yl)carbamate 6 has been demonstrated at the multikilogram scale. In this reaction, a racemic ketone is resolved by reducing the undesired ketone using a ketone reductase (KRED). The reduction is stereospecific for the 2-position of substrate (2S)-ketone leaving the (2R)-ketone unreacted. After the (2S)-ketone has been depleted, a transaminase is added to catalyze
已经在多千克规模上证明了
生物催化级联产生叔丁基((2 R,4 R)-2-甲基四氢-2 H-
吡喃-4-基)
氨基甲酸酯6。在该反应中,通过使用酮还原酶(KRED)还原不需要的酮来拆分外消旋酮。还原对于底物(2 S)-酮的2-位是立体特异性的,而使(2 R)-酮未反应。耗尽(2 S)酮后,添加转
氨酶以催化酮的对映选择性
氨基转移,从而形成(2 R,4 R)-胺6。Boc保护后,从
水反应中回收产物。