Cobalt-Catalyzed Asymmetric Hydrogenation of 1,1-Diarylethenes
作者:Jianhui Chen、Chenhui Chen、Chonglei Ji、Zhan Lu
DOI:10.1021/acs.orglett.6b00453
日期:2016.4.1
Highlyenantioselective cobalt-catalyzed hydrogenation of 1,1-diarylethenes was developed by using bench-stable chiral oxazoline iminopyridine–cobalt complexes as precatalysts. A unique o-chloride effect was observed to achieve high enantioselectivity. Easy removal as well as further transformations of the chloro group make this protocol a potentially useful alternative to synthesize various chiral
Microwave-Assisted, Pd(0)-Catalyzed Cross-Coupling of Diazirines with Aryl Halides
作者:Xia Zhao、Guojiao Wu、Chong Yan、Kui Lu、Hui Li、Yan Zhang、Jianbo Wang
DOI:10.1021/ol102434v
日期:2010.12.3
Pd(0)-catalyzed cross-coupling reactions of diazirines with aryl halides under microwave heating conditions afford a series of substituted olefins. A reactionmechanism involving the migratory insertion of the Pdcarbene intermediate is proposed.
Chiral iridium complexes ligated by anionic oxazoline-bearing NCP-type pincer ligands were developed and applied to the asymmetric transfer hydrogenation (ATH) of diarylethenes using environmentally benign ethanol as the hydrogen donor. High enantioselectivities could be achieved for substrates bearing ortho-Me, ortho-Cl, or ortho-Br substituents on one of the aryl groups. The ATH of ortho-Br-substituted
开发了由带有阴离子恶唑啉的 NCP 型钳形配体连接的手性铱配合物,并将其应用于使用环境友好型乙醇作为氢供体的二芳基乙烯的不对称转移氢化 (ATH)。对于在芳基之一上带有邻-Me、邻-Cl或邻-Br取代基的底物可以实现高对映选择性。由于 C (芳基) -Br 键易于经历各种新的键形成事件,邻位-Br 取代的二芳基乙烯的 ATH特别有吸引力。