A new method for the preparation of 3,4-dihydro - and 1,2,3,4-tetrahydro-.BETA.-carbolines.
作者:AKIHIKO ISHIDA、TOHRU NAKAMURA、KUNIHIKO IRIE、TOKURO OHISHI
DOI:10.1248/cpb.33.3237
日期:——
N-Alkylthiocarbonyltryptophan (2a-i) and tryptamine (2j-m) derivatives can be converted into the corresponding 3, 4-dihydro-β-carbolines (3) under mild conditions by the use of alkylating or acylating agents. The NaBH4 reduction of 1, 3-disubstituted 3, 4-dihydro-β-carbolines (3a-i) gave cis- (5) or trans-1, 2, 3, 4-tetrahydro-β-carbolines (6) with satisfactory stereoselectivity. The synthesis of optically active 3a, b and 5a, b is also described.
N-烷基硫羰基色氨酸(2a-i)和色氨酸(2j-m)衍生物可以在温和条件下通过烷基化或酰基化剂转化为相应的3, 4-二氢-β-氨基吲哚(3)。1, 3-二取代的3, 4-二氢-β-氨基吲哚(3a-i)经过NaBH4还原,得到了具有满意立体选择性的顺式(5)或反式-1, 2, 3, 4-四氢-β-氨基吲哚(6)。本文还描述了外消旋活性3a, b和5a, b的合成。