New Resolution of 2-Formyl-1,4-DHP Derivatives Using CIDR Methodology. Facile Access to New Chiral Tricyclic Thiolactam
作者:Štefan Marchalín、Katarína Cvopová、Miroslav Križ、Peter Baran、Hassan Oulyadi、Adam Daïch
DOI:10.1021/jo049706s
日期:2004.6.1
Separate condensation of other chiral (8 and 13) and racemic (18) amino thiols as auxiliary with rac-4, (4S)-4, or (4R)-4 is accompanied by an in situ crystallization-induced dynamic resolution, whereby one distereomer of thiazole template selectively precipitates and can be isolated by simple filtration in 76−82% yield with dr > 99. The thiazole species isolated from this process resulted from an amino
(R)-和(S)-α-苯乙胺(α-PEA:7)已分别用于成功拆分外消旋物2-甲酰基-1,4-DHP衍生物4。该过程基于两种席夫碱(6)的溶解度差异,因为其中一种已从溶液中结晶出来。通过(R)-α-PEA(7)或(S)-α-PEA(7)与醛(rac - 4)缩合获得的这些亚胺经X射线衍射分离和分析,并暴露于盐酸中导致了对映体纯(4水解条件- [R )- 4或(4小号)- 4以优良产率。其他手性(8和13)和外消旋(18)氨基硫醇作为辅助与rac - 4,(4 S)-4或(4 R)-4的缩合伴随有原位结晶诱导的动态拆分,因此,噻唑模板的一种对映异构体选择性沉淀,可以通过简单过滤以76-82%的收率(dr> 99)进行分离。从该过程中分离出的噻唑种类是由氨基醛缩合和随后的自发硫醇-亚胺环加成反应产生的。最后,外消旋体(±)-(4R,2'R)-19和非对映体纯的同源(4 S,2'R)-23和(4 R,2