Gold(I)-Catalyzed Oxidative Cleavage of a C−C Double Bond in Water
摘要:
Oxidative cleavage of the C=C bond to afford ketone or aldehyde products with tent-butyl hydrogenperoxide (TBHP) as the oxidant can be catalyzed by AuCl with neocuproine (1) in water.
Arene-catalysed lithiation of triflates and triflamides under barbier-type conditions: An indirect transformation of alcohols and amines into organolithium compounds
作者:Emma Alonso、Diego J Ramón、Miguel Yus
DOI:10.1016/0040-4020(96)00886-1
日期:1996.11
The reaction of alkyl triflates 1 or allyl or benzyl triflamides 3 with an excess of lithium powder and a catalytic amount of naphthalene (4 mol %) in the presence of different electrophiles [Me3SiCl, PriCHO, ButCHO, PhCHO, 4-MeOC6H4CHO, CH3(CH2)6CHO, Et2CO, (CH2)5CO, (c-C3H5)2CO, PhCOMe, 4-MeC6H4COPh, PhCH=NPh, n-C8H7CON(CH2)4] in THF at temperature ranging between −78 and 0°C leads, after hydrolysis
烷基三氟甲磺酸酯的反应1或烯丙基或苄基triflamides 3在不同的亲电子[我的存在下用过量的锂粉末和萘的催化量的(4摩尔%)3的SiCl,镨我CHO,卜吨CHO,苯甲醛, 4-MeOC 6 H 4 CHO,CH 3(CH 2)6 CHO,Et 2 CO,(CH 2)5 CO,(c -C 3 H 5)2 CO,PhCOMe,4-MeC 6 H 4 COPh,PhCH = NPh,n -C在-78至0°C之间的温度下,在THF中的8 H 7 CON(CH 2)4 ]导致水解后生成相应的缩合产物2。当将α,β-不饱和羰基化合物用作亲电子化合物时,取决于所使用的亲电子试剂,发生1,2-(2-环己烯酮)或1,4-加成(肉桂醛或亚苄基丙酮)。
DMSO-catalyzed chlorination of alcohols using N-phenylbenzimidoyl chloride
作者:Qiang Wang、Jian Xu、Zhou-Qing Xu、Ji-Dan Yan
DOI:10.1007/s11164-012-0738-z
日期:2013.5
N-phenylbenzimidoyl chloride has been demonstrated as an efficient chlorination reagent catalyzed by dimethyl sulfoxide (DMSO) in conversion of alcohols to corresponding chlorides. The reaction conditions were mild, and most of the substrates gave satisfactory yields. The configurationinversion of the chlorination was proved using optically active phenyl alcohols. The amount of DMSO can be as low as
Chemoselective Etherification
of Benzyl Alcohols Using 2,4,6-Trichloro-1,3,5-triazine and Methanol
or Ethanol Catalyzed by Dimethyl Sulfoxide
作者:Chunbao Li、Lili Sun、Yuping Guo、Guisheng Peng
DOI:10.1055/s-0028-1083184
日期:——
An efficient method for the transformation of benzyl alcohols into their methyl or ethyl ethers has been established using 2,4,6-trichloro-1,3,5-triazine (TCT) and dimethyl sulfoxide in methanol or ethanol. This procedure chemoselectively converts benzylic hydroxys into their methyl or ethyl ethers in the presence of aliphatic or phenolic hydroxys.
Enantioselective addition of organozinc reagents to ketones catalyzed by grafted isoborneolsulfonamide polymers and titanium isopropoxide
作者:Vicente J. Forrat、Diego J. Ramón、Miguel Yus
DOI:10.1016/j.tetasy.2009.01.011
日期:2009.1
The catalytic enantioselective addition of different organozinc reagents, such as diethylzinc, or in situ generated phenylzinc derivatives to simple aryl methyl ketones was accomplished using titanium tetraisopropoxide and a polymeric ligand grafted with trans-1-phenylsulfonylamino-2-isoborneolsulfonylamidocyclohexane, to give the corresponding tertiary alcohols with enantioselectivities of up to >99%
A novel and efficient method for the olefination of carbonyl compounds with Grignard reagents in the presence of diethyl phosphite
作者:Tongqiang Wang、Yuanyuan Hu、Songlin Zhang
DOI:10.1039/c001931c
日期:——
The widely available carbonyl compounds react with Grignardreagents in the presence of diethyl phosphite to give the corresponding olefins in good to excellent yields: A range of conjugated dienes, terminal olefins, multisubstituted-alkenes and conjugated enynes could be readily obtained by the method in mild conditions.