Kinetic Resolution of Chiral Cyclohex-2-enones by Rhodium(I)/binap-Catalyzed 1,2- and 1,4-Additions
摘要:
The feasibility of kinetic resolutions of racemic monosubstituted cyclohex-2-enones by Rh/binap-catalyzed reactions was investigated. 1,2-Addition of AlMe3 to the 5-substituted derivatives furnished allylic alcohols in the matched case, while the less reactive enantiomers were either left over or transformed into trans-3,5-disubstituted cyclohexanones in parallel or sequential 1,4-additions. Altogether, these represent regiodivergent reactions on racemic mixtures. In contrast, 1,4-addition of aryl groups led to inferior results since either catalyst or substrate control dominated.
Kinetic Resolution of Chiral Cyclohex-2-enones by Rhodium(I)/binap-Catalyzed 1,2- and 1,4-Additions
作者:Andreas Kolb、Sebastian Hirner、Klaus Harms、Paultheo von Zezschwitz
DOI:10.1021/ol300387f
日期:2012.4.20
The feasibility of kinetic resolutions of racemic monosubstituted cyclohex-2-enones by Rh/binap-catalyzed reactions was investigated. 1,2-Addition of AlMe3 to the 5-substituted derivatives furnished allylic alcohols in the matched case, while the less reactive enantiomers were either left over or transformed into trans-3,5-disubstituted cyclohexanones in parallel or sequential 1,4-additions. Altogether, these represent regiodivergent reactions on racemic mixtures. In contrast, 1,4-addition of aryl groups led to inferior results since either catalyst or substrate control dominated.
Design, synthesis, and properties of des-D-ring interphenylene derivatives of 1α,25-Dihydroxyvitamin D3
(NR1I1) reporter assay revealed that the des-D-ring interphenylene analogs exhibited a certain VDR binding affinity and ability to promote gene transcription. In particular, analogs having a side chain with an appropriate length at meta position showed high gene transcription promoting activities comparable to those of 1α,25-dihydroxyvitaminD3 and its 19-nor derivative.
维生素 D 3的新型去-D-环间亚苯基类似物是基于它们的构象分析和使用配体-蛋白质对接模拟估计的对维生素 D 受体 (VDR) 的亲和力而设计的。根据该设计,通过des-D、C-环和A-环中间体的Suzuki-Miyaura偶联反应合成了一系列des - D-环间亚苯基类似物。荧光偏振 VDR 竞争者测定、时间分辨荧光共振能量转移 VDR 共激活剂结合测定和人类 VDR (NR1I1) 报告基因测定表明,des-D-环间亚苯基类似物表现出一定的VDR结合亲和力和促进基因转录的能力。特别地,在间位具有适当长度的侧链的类似物显示出与1α,25-二羟基维生素D 3及其19 - nor衍生物相当的高基因转录促进活性。