通过使用铱/f-Ampha 配合物作为催化剂,开发了一种通用且高效的 α,β-不饱和酮的不对称顺序氢化方法,以高收率提供具有两个连续立体中心的相应手性醇,并具有优异的非对映和对映选择性(高达 99% 的产率,>20 : 1 dr 和 >99% ee)。对照实验表明,烯酮的 C C 和 C O 键依次氢化,最终的立体选择性由酮的动态动力学拆分决定。此外,DFT 计算表明,外球途径参与了 C C 和 C的减少。O 烯酮键。该方法的合成效用通过克级反应和极低催化剂负载量 (S/C = 20 000) 和获得抗哮喘药物 CP-199,330 的关键手性中间体的简明合成路线得到证明。
Stereodivergently asymmetric synthesis of chiral phosphorus compounds by synergistic combination of ion-pair catalyst and base
作者:Hui-Lin Hu、Xiaoyu Ren、Jiajia He、Lixiang Zhu、Siqiang Fang、Zhishan Su、Tianli Wang
DOI:10.1007/s11426-022-1337-3
日期:2022.12
accessing to chiral phosphorus compounds bearing two adjacent chiral centers particularly containing an acidic protonated enantioenriched carbon atom, having broad functional group compatibility in both dynamic and thermodynamic processes under mild reaction conditions. Two keys for the success in constructing these stereoisomers with high levels of regio-, diastereo-, and enantioselectivities were contained:
Synthesis of 2,4-diaryl chromenopyridines and evaluation of their topoisomerase I and II inhibitory activity, cytotoxicity, and structure–activity relationship
作者:Uttam Thapa、Pritam Thapa、Radha Karki、Minho Yun、Jae Hun Choi、Yurngdong Jahng、Eunyoung Lee、Kyung-Hwa Jeon、Younghwa Na、Eun-Mi Ha、Won-Jea Cho、Youngjoo Kwon、Eung-Seok Lee
DOI:10.1016/j.ejmech.2011.04.029
日期:2011.8
Designed and synthesized were a series of 5H-chromeno[4,3-b]pyridines with substitution at 2- and 4-positions with various 5- or 6-membered heteroaromatics as antitumor agents. They were evaluated for topoisomerase I and II inhibitory activities as well as cytotoxicities against several human cancer cell lines. Structure activity relationship study showed that 2-furyl or 2-thienyl at 2- or 4-position of central pyridine is crucial in displaying topo I or II inhibitory activity and cytotoxicity. (C) 2011 Elsevier Masson SAS. All rights reserved.
A general and highly efficient method for asymmetric sequential hydrogenation of α,β-unsaturated ketones has been developed by using an iridium/f-Ampha complex as the catalyst, furnishing corresponding chiral alcohols with two contiguous stereocenters in high yields with excellent diastereo- and enantioselectivities (up to 99% yield, >20 : 1 dr and >99% ee). Control experiments indicated that the CC
通过使用铱/f-Ampha 配合物作为催化剂,开发了一种通用且高效的 α,β-不饱和酮的不对称顺序氢化方法,以高收率提供具有两个连续立体中心的相应手性醇,并具有优异的非对映和对映选择性(高达 99% 的产率,>20 : 1 dr 和 >99% ee)。对照实验表明,烯酮的 C C 和 C O 键依次氢化,最终的立体选择性由酮的动态动力学拆分决定。此外,DFT 计算表明,外球途径参与了 C C 和 C的减少。O 烯酮键。该方法的合成效用通过克级反应和极低催化剂负载量 (S/C = 20 000) 和获得抗哮喘药物 CP-199,330 的关键手性中间体的简明合成路线得到证明。