Total Synthesis of Racemic and Optically Active Compounds Related to Physostigmine and Ring-C Heteroanalogues from 3-[2?-(dimethylamino)ethyl]2,3-dihydro-5-methoxy-1,3-dimethyl-1H-indo l-2-ol
作者:Xue-Feng Pei、Nigel H. Greig、Judith L. Flippen-Anderson、Sheng Bi、Arnold Brossi
DOI:10.1002/hlca.19940770519
日期:1994.8.10
ne (19), and (±)-phenserine (4) from 6 and 16 are described. Optically active 8a and 8b, obtained by chemical resolution, similarly gave the enantiomers 6a and 14a–16a of the (3aS)-series (prepared earlier from physostigmine (1a)) and their (3R)-enantiomers. The anticholinesterase activity of (±)-4, (±)-18, and (±)-19 was compared with that of their optically active enantiomers.
羟吲哚11,上得到3- [2' - (二甲基氨基)乙基]羟基吲哚的烷基化12,得到在与钠dihydridobis(2-甲氧基乙氧基)铝立体选择性还原,氨基醇8(方案2)。季碘化物10,从获得的8用MeI,给,在亲核取代具有同时发生的霍夫曼消除,(±)-esermethole 6,(±)-5- Ô -methylphysovenol(14),(±)-5- ø -甲基-1-噻吩甲酚(15)和(±)-1-苄基-1-脱甲基乙二酚(16)。(±)-1-苄基-1-去甲基苯丙氨酸的合成(描述了18),6和16中的(±)-1-去甲基菲丝氨酸(19)和(±)-菲丝氨酸(4)。通过化学拆分获得的旋光活性8a和8b类似地得到(3a S)系列的对映体6a和14a-16a(较早从毒扁豆碱(1a)制备)和它们的(3 R)对映体。将(±)-4,(±)-18和(±)-19的抗胆碱酯酶活性与其旋光对映异构体的抗胆碱酯酶活性进行了比较。