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。
Highly Enantioselective Catalytic Phenylation of Ketones with a Constrained Geometry Titanium Catalyst
作者:Celina García、Patrick J. Walsh
DOI:10.1021/ol0352963
日期:2003.10.1
[reaction: see text] The catalytic asymmetric addition of phenyl groups from diphenylzinc to ketones is reported. The catalyst, generated from a dihydroxy bis(sulfonamide) ligand and titanium tetraisopropoxide, gives good to excellent enantioselectivities with a range of substrates.