3-(3,4-二氯苯基)-2-丙炔-1-醇 在
三(三苯基膦)氯化铑(I)氢气 、 silica gel 、 正己烷 、 乙酸乙酯 作用下,
以
甲苯 为溶剂,
反应 10.0h,
以to give the object product (2.83 g) as a brown oil的产率得到3-(3,4-dichlorophenyl)propan-1-ol
Ligand-Controlled Regioselective Copper-Catalyzed Trifluoromethylation To Generate (Trifluoromethyl)allenes
作者:Brett R. Ambler、Santosh Peddi、Ryan A. Altman
DOI:10.1021/acs.orglett.5b01027
日期:2015.5.15
report the first example of a Cu-catalyzed trifluoromethylation reaction in which a ligand controls the regiochemical outcome. More specifically, we demonstrate the ability of bipyridyl-derived ligands to control the regioselectivity of the Cu-catalyzed nucleophilic trifluoromethylation reactions of propargyl electrophiles to generate (trifluoromethyl)allenes. This method provides a variety of di-
A unique approach to biaryls was developed on the basis of propargyl vinyl ethers and dienophiles substrates via a gold(I)-initiated cycloisomerization/Diels–Alder/retro-Diels–Alder cascade reaction. The scope and mechanism of the reaction were investigated on the basis of a series of synthetic substrates, control experiments, and DFT calculations.
phosphoramidites is a paracyclophane scaffold in which two aryl rings are tethered by both a 1,8‐biphenylene unit and a O−P−O bridge. Suitable aryl substituents generate planar chirality. The corresponding gold(I) complexes promote the cycloisomerization of prochiral nitrogen‐tethered dienynes. These reactions afford bicyclo[4.1.0]heptene derivatives displaying three contiguous stereogenic centers
Catalytic One-Step Deoxytrifluoromethylation of Alcohols
作者:Francisco de Azambuja、Sydney M. Lovrien、Patrick Ross、Brett R. Ambler、Ryan A. Altman
DOI:10.1021/acs.joc.8b03072
日期:2019.2.15
A new bench-stable trifluoromethylation reagent, phenyl bromodifluoroacetate, converts readily available alcohols to trifluoromethanes in a Cu-catalyzed deoxytrifluoromethylation reaction. This reaction streamlines access to target biologically active molecules, and should be useful for a variety of medicinal, agricultural, and materials chemists.
A highlyenantioselective [2,3] Wittig rearrangement of oxindole derivatives was realized by using a chiral N,N′‐dioxide/NiII complex as the catalyst under mild reaction conditions. A strong chiral amplification effect was observed, and allowed access to chiral 3‐hydroxy 3‐substituted oxindoles bearing allenyl groups in high yields and enantioselectivities (up to 92 % ee) by using a ligand with only
通过在温和的反应条件下使用手性N,N'-二氧化物/ Ni II络合物作为催化剂,可以实现羟吲哚衍生物的高对映选择性[2,3] Wittig重排。观察到很强的手性扩增效果,并且通过使用仅含15%ee的配体,可以高收率和对映选择性(高达92%ee)接近带有烯丙基的手性3-羟基3-取代的羟吲哚。根据实验研究和对映体纯和外消旋催化剂的X射线晶体结构,给出了合理的解释。此外,通过[2,3] Wittig重排实现了外消旋羟吲哚衍生物的第一催化动力学拆分,具有很高的效率和立体选择性。