有机卤化物的催化羰基化是化学合成中重要的 CC 键形成。未活化烷基卤化物的羰基化仍然是一个挑战,目前需要在苛刻条件和高压 CO 下使用烷基碘。在此我们报告了钯催化的仲烷基溴烷氧基羰基化,在温和条件下在低压 (2 atm CO) 下进行. 初步机理研究与混合有机金属-自由基过程一致。这些反应有效地将未活化烷基溴的酯传递到各种底物上,并代表了烷基溴与一氧化碳的第一次催化羰基化。
Nickel-Catalyzed Cross-Couplings of Organosilicon Reagents with Unactivated Secondary Alkyl Bromides
作者:David A. Powell、Gregory C. Fu
DOI:10.1021/ja047433c
日期:2004.6.1
A metal-catalyzed cross-coupling of organosilicon compounds with alkyl halides has been developed. Noteworthy attributes of the method are its scope (secondary electrophiles), its high functional-group compatibility, and the air stability of the catalyst components.
Nickel‐Catalyzed Stereo‐ and Enantioselective Cross‐Coupling of
<i>gem</i>
‐Difluoroalkenes with Carbon Electrophiles by C−F Bond Activation
作者:Ziqi Zhu、Lin Lin、Jieshuai Xiao、Zhuangzhi Shi
DOI:10.1002/anie.202113209
日期:2022.2
AbstractStereo‐ and enantioselective cross‐electrophile coupling involving C−F bond activation is reported. Treatment of gem‐difluoroalkenes with racemic benzyl electrophiles in the presence of a chiral nickel complex using B2pin2 as a stoichiometric reductant allows the construction of a C(sp2)−C(sp3) bond under mild conditions, affording a broad range of monofluoroalkenes bearing stereogenic allylic centers. Initial mechanistic studies indicate that a radical chain pathway may be operating, wherein the ester group in the gem‐difluoroalkene promotes C−F bond activation through oxidative addition to a Ni species.
METHOD FOR PREPARING SILAHYDROCARBONS
申请人:UNIVERSITY OF DELAWARE
公开号:US20190225629A1
公开(公告)日:2019-07-25
The present disclosure is directed to a process for preparing silahydrocarbons of formula (I):
the process including the step of reacting a compound of formula (II):
R
1
-MX (II)
with a compound of formula (III):
as well as to silahydrocarbons prepared by such a process, and to compositions and articles of manufacture containing such silahydrocarbons.