A stereocontrolled synthesis of a new class of 3,4,5,6-tetrahydropyrimidine-based chiral amino acids
作者:Adel Zamri、Finton Sirockin、Mohamed A. Abdallah
DOI:10.1016/s0040-4020(99)00177-5
日期:1999.4
The stereocontrolled synthesis of seven 2-substituted-4-carboxy-3,4,5,6-tetrahydropyrimidines bearing either one chiral center at C-4 or two chiral centers at C-4 and C-8 was performed by condensation of (S)- or (R)-2, 4-diaminobutyric acid (Daba) with iminoethers derived from glycine. (S)- and (R serine, (S)- and (R)-tyrosine. Under the conditions reported, epimerization was always completely prevented at the C-4 center, whereas at the C-8 center, it was completely avoided in the case of tyrosine derivatives and considerably diminished for the serine derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.
Leonova, T. N.; Muraveiskaya, G. S.; Shchelokov, R. N., Russian Journal of Inorganic Chemistry, 1981, vol. 26, p. 457 - 458
作者:Leonova, T. N.、Muraveiskaya, G. S.、Shchelokov, R. N.
DOI:——
日期:——
[EN] PROSTAGLANDIN ANALOGS<br/>[FR] ANALOGUES DE PROSTAGLANDINE
申请人:ALLERGAN INC
公开号:WO2006014207A1
公开(公告)日:2006-02-09
Compounds comprising formula (I): or a pharmaceutically acceptable salt or a produg thereof is disclosed herein. A, X, J, E, and Z are as described herein. These compounds are useful for treating glaucoma or ocular hypertension.
Enantioselective synthesis of optically pure natural S(+) or unnatural R(-) DABA
作者:A. Solladié-Cavallo、M.C. Simon
DOI:10.1016/s0040-4039(01)93841-9
日期:1989.1
After optimization of the reaction conditions, opticallypure S(+) DABA is obtained in more than 80% overall yield. A model is proposed to explain the dependence of asymmetric induction on the nature of the counter ion (Li+, Mg++, Bu4N+).
在优化反应条件之后,以超过80%的总收率获得了光学纯的S(+)DABA。提出了一个模型来解释不对称感应对反离子(Li +,Mg ++,Bu 4 N +)性质的依赖性。