Catalytic hydrogenation of α,β-unsaturated carboxylic acid derivatives using copper(<scp>i</scp>)/N-heterocyclic carbene complexes
作者:Birte M. Zimmermann、Sarah C. K. Kobosil、Johannes F. Teichert
DOI:10.1039/c8cc09853k
日期:——
air-stable copper(I)/N-heterocyclic carbene complex enables the catalytic hydrogenation of enoates and enamides, hitherto unreactive substrates employing homogeneous copper catalysis and H2 as a terminal reducing agent. This atom economic transformation replaces commonly employed hydrosilanes and can also be carried out in an asymmetric fashion.
Hypervalent iodine(III) catalyzed radical hydroacylation of chiral alkylidenemalonates with aliphatic aldehydes under photolysis
作者:Sermadurai Selvakumar、Qi-Kai Kang、Natarajan Arumugam、Abdulrahman I. Almansour、Raju Suresh Kumar、Keiji Maruoka
DOI:10.1016/j.tet.2017.08.018
日期:2017.10
bearing (−)-8-phenylmenthol as a chiral auxiliary with aliphaticaldehydes is realized under photolysis. This work represent the first example of diastereoselective addition of acyl radicals to olefins to afford chiral ketones in a highly stereoselective fashion. The reaction is initiated by the photolysis of hypervalent iodine(III) catalyst under mild and metal-free conditions. The synthetic potential
A new convenient procedure to prepare organomanganese reagents from organic halides and activated manganese
作者:Gérard Cahiez、Arnaud Martin、Thomas Delacroix
DOI:10.1016/s0040-4039(99)01331-3
日期:1999.8
A newmethod to obtain activated manganese metal, especially attractive for large scale preparativeorganicchemistry, is described. The key point is the use of 2-phenylpyridine as electron carrier to reduce manganese chloride by lithium. The active manganese thus obtained was used to prepare various organomanganese reagents from organic halides. The reactivity of these reagents has been studied (acylation
Diboron-mediated rhodium-catalyzed transfer hydrogenation of functionalized arenes is reported. In addition to good functional group tolerance, the reaction features operational simplicity and controllable chemoselectivity. The general applicability of this procedure is demonstrated by the selective hydrogenation of a range of arenes, including functionalized benzenes, biphenyls, and polyaromatics
Asymmetric 1,4-reductions of and 1,4-additions to enoates and related systems
申请人:Massachusetts Institute of Technology
公开号:US06465664B1
公开(公告)日:2002-10-15
One aspect of the present invention relates to methods for the transition-metal-catalyzed asymmetric 1,4-addition of a nucleophile, e.g., hydride, to cyclic and acyclic enoates and enones. In certain embodiments of the methods of the present invention, the transition metal catalyst consists essentially of copper and an asymmetric bidentate bisphosphine ligand.