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)。
Effect of InCl 3 on the addition of Grignard reagents to α,β-unsaturated carbonyl compounds
作者:Brian G. Kelly、Declan G. Gilheany
DOI:10.1016/s0040-4039(01)02263-8
日期:2002.1
Control of 1,2- versus 1,4-addition of organometallic reagents to enones remains a long-standing problem. There is still no satisfactory 1,2-directing agent comparable to the 1,4-directing effect of copper salts. We report that the presence of just 5 mol% indium(III) chloride can significantly alter the amount of 1,2-product formed in these reactions.
Catalytic C–H Arylation of Aliphatic Aldehydes Enabled by a Transient Ligand
作者:Ke Yang、Qun Li、Yongbing Liu、Guigen Li、Haibo Ge
DOI:10.1021/jacs.6b08478
日期:2016.10.5
The direct arylation of aliphaticaldehydes has been established via Pd-catalyzed sp3 C-H bond functionalization in the presence of 3-aminopropanoic acids as transient directing groups. The reaction showed excellent functional group compatibility and chemoselectivity in which a predominant preference for functionalizing unactivated β-C-H bonds of methyl groups over others was achieved. In addition
Ni(acac)(2) catalyzes homoallylation of aldehydes with 1,3-dienes in the presence of triethylborane. Triethylborane serves as a reducing agent delivering a formal hydride to the C2 position of 1,3-dienes, thus generating a formal homoallyl anion species and enabling the novelhomoallylation of aldehydes. The reaction proceeds smoothly at room temperature in the absence of any phosphane or nitrogen
Hydride reduction of alpha, beta-unsaturated carbonyl compounds using chiral organic catalysts
申请人:MacMillan David
公开号:US20060161024A1
公开(公告)日:2006-07-20
Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction is enantioselective, and proceeds with a variety of hydride donors, catalysts, and substrates. The invention also provides compositions effective in carrying out the 1,4-hydride addition of α,β-unsaturated carbonyl compounds.