Novel resolution of the anthracyclinone intermediate by the use of (2r, 3r)-(+)- and (2s, 3s)-(-).1,4-bis(4-chlorobenzyloxy)butane-2,3-diol
作者:Katsumi Tamoto、Masamichi Sugimori、Shiro Terashima
DOI:10.1016/s0040-4020(01)91522-4
日期:1984.1
diastereomereic acetals((-)-9and(+)-10 or(+)-9 and(-)-10)with the title vicinal-diol(+)-or ( )-5), affording optically pure (R)-( )-3. The resolving agents (( + )- and ( )-5) were readily synthesized from unnatural(2S,3S)-(-)-tartaric acid((-)-6)or D-(-)-mannitol and natural (2R,3R)-(+)-tartaric acid((+)6), respectively. The undesired enantiomer ((S)-(+ )-3) obtained by the optical resolution could be racemized
发现(±)-7-Deoxy-4-demethoxydaunomycinone((±)-3)通过形成非对映体缩醛((-)- 9和(+)- 10或(+)- 9)的混合物而干净地溶解了。和(-)- 10)标题为邻位的-二醇(+)-或()-5),提供光学纯的(R)-()- 3。拆分剂((+)-和()-5)易于由非天然(2S,3S)-(-)-酒石酸((-)- 6)或D-(-)-甘露醇与天然(2R ,3R)-(+)-酒石酸((+)6)。不需要的对映异构体((S)-(+)- 3通过光学拆分获得的α(α)可以通过与三氟甲磺酸在乙酸水溶液中加热而消旋。通过高度立体选择性(⪢20:1)引入,将光学纯的(R)-3精细化为光学纯的(+)-4-脱甲氧基金牛烯酮((+)- 2b)和(+)-脱甲氧基腺嘌呤酮((+)- 2a)。OH基团进入C 7位是关键步骤。