MgBr 2促进ArTi(O i Pr)3的对映体选择性芳基加成到N,N'-磺酰化(1 R,2 R)-环己烷-1,2-二胺†的钛(iv)催化剂上的酮中
摘要:
据报道,MgBr 2促进了N,N'-磺酰化(1 R,2 R)-环己烷-1,2-二胺的钛催化剂催化的酮类化合物向酮中不对称地添加ArTi(O i Pr)3,结果表明:具有吸电子基团的手性N,N'-磺酰化环己烷-1,2-二胺可以有效催化不对称地将ArTi(O i Pr)3加到酮上,以高收率提供所需的叔醇,并具有良好的对映选择性。到95%ee。
Polymer supported trans-1-phenylsulfonylamino-2-isoborneolsulfonylaminocyclohexane ligand for the titanium catalyzed organozinc addition to ketones
作者:Vicente J. Forrat、Diego J. Ramón、Miguel Yus
DOI:10.1016/j.tetasy.2006.07.038
日期:2006.8
The catalytic enantioselective addition of different organozinc reagents, such as diethylzinc, or in situ generated phenylzinc derivatives to simple ketones was accomplished using titanium tetraisopropoxide and supported chiral ligands derived from trans-1-phenylsulfonylamino-2-isoborneolsulfonylamidocyclohexane, to give the corresponding tertiary alcohols with enantioselectivities up to >99%. A simple
A Nickel Catalyst for the Addition of Organoboronate Esters to Ketones and Aldehydes
作者:Jean Bouffard、Kenichiro Itami
DOI:10.1021/ol9017613
日期:2009.10.1
Ni(cod)2/IPr catalyst promotes the intermolecular 1,2-addition of arylboronate esters to unactivated aldehydes and ketones. Diaryl, alkyl aryl, and dialkyl ketones show good reactivity under mild reaction conditions (≤80 °C, nonpolar solvents, no strong base or acid additives). A dramatic ligand effect favors either carbonyl addition (IPr) or C−OR cross-coupling (PCy3) with aryl ether substrates. A Ni(0)/Ni(II)
Chiral diamine compounds for the preparation of chiral alcohols and chiral amines
申请人:University College Dublin
公开号:US10196338B2
公开(公告)日:2019-02-05
Processes for stereoselective preparation of a chiral alcohol or a chiral amine are described. The processes include reacting a first prochiral reactant selected from the group consisting of a ketone, an aldehyde, and an imine, with a second reactant that includes a Grignard reagent, in the presence of a chiral trans-diamine of formula (1) as defined herein:
Nickel-Catalyzed Enantioselective Reductive Arylation of Common Ketones
作者:Shuai Huang、Jianrong Steve Zhou
DOI:10.1021/jacs.4c02818
日期:2024.5.15
nickel complex of chiral bisoxazolines catalyzed the stereoselective reductive arylation of ketones in high enantioselectivity. A range of common acyclic and cyclic ketones reacted without the aid of directing groups. Mechanistic studies using isolated complex of a chiral bis(oxazoline) (L)Ni(Ar)Br revealed that Mn reduction was not needed, while Lewis acidic titanium alkoxides were critical to ketone insertion