N-Alkylthiocarbonyldopa (1a-e) and dopamine (1f-h) derivatives can be converted into the corresponding 3, 4-dihydroisoquinolines (3) by treatment with 4-nitrobenzyl bromide. The NaBH4 reduction of 1, 3-disubstituted 3, 4-dihydroisoquinolines (3a-e) gave 1, 3-cis-1, 2, 3, 4-tetrahydroisoquinolines (4a-e). Hydrogenation of 3a-e over PtO2 also gave 4a-e in good yields. The synthesis of optically active 3a, i and 4a, i is also described.
N-烷基
硫羰基多巴(1a-e)和
多巴胺(1f-h)衍
生物可以通过与4-硝基苄
溴的反应转化为相应的3, 4-二氢
异喹啉(3)。1, 3-二取代的3, 4-二氢
异喹啉(3a-e)经过NaBH4还原后得到1, 3-顺-1, 2, 3, 4-
四氢异喹啉(4a-e)。在PtO2上对3a-e进行氢化反应也能获得良好产率的4a-e。还描述了光学活性3a, i和4a, i的合成。