achieved with a two-step protocol comprising an allylic cation mediated nucleophilic addition and an intramolecular cyclization reaction. The N-aryl sulfonyl protecting groups of cyclization products were readily removed to furnish free amines with retention of halogensubstitutions and CC double bonds.
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.
Lewis Acids Promoted 3 + 2 Cycloaddition of Oxaziridines and Cyclic Allylic Alcohols through Carbonyl Imine Intermediates
作者:Erbao Zhao、Feilong Zhou、Yujun Zhao
DOI:10.1021/acs.joc.9b00246
日期:2019.4.5
Syntheses of isoxazolidines through the carbonyl imine intermediates are currently limited to monosubstituted olefin substrates. Herein, we reported syntheses of novel bicyclic isoxazolidine-containing compounds through 1,3-dipolar cycloaddition reactions using cyclic allylicalcohols as substrates, which proved challenging in previous reports. Generally, the reaction yields range from good to high
Catalytic Enantioselective Conjugate Addition of Grignard Reagents to Cyclic Enones Using<i>C</i><sub>1</sub>-1,1′-Bisisoquinoline-Based Chiral Ligands
作者:Gao Qi、Zaher M. A. Judeh
DOI:10.1080/00397911.2010.541969
日期:2012.6
Abstract New highly constrained chiral C 1-1,1′-bisisoquinoline ligands were examined in the enantioselectiveconjugateaddition of Grignard reagents to cyclohexenone and cyclopentenone. The desired 1,4-adducts were obtained in excellent yield and moderate enantiomeric excess (up to 35%). GRAPHICAL ABSTRACT
摘要 在格氏试剂与环己烯酮和环戊烯酮的对映选择性共轭加成中,研究了新的高度受限的手性 C 1-1,1'-双异喹啉配体。以极好的收率和适度的对映体过量(高达 35%)获得了所需的 1,4-加合物。图形概要