A direct approach to amines with remote stereocentres by enantioselective CuH-catalysed reductive relay hydroamination
作者:Shaolin Zhu、Nootaree Niljianskul、Stephen L. Buchwald
DOI:10.1038/nchem.2418
日期:2016.2
elements in many pharmaceutical agents and natural products. However, previously reported methods to prepare these compounds in an enantioselective manner are indirect and require multistep synthesis. Here, we report a copper-hydride-catalysed, enantioselectivesynthesis of γ- or δ-chiral amines from readily available allylic alcohols, esters and ethers using a reductive relay hydroamination strategy (a
Highly Stereoselective Cobalt-Catalyzed Allylation of Functionalized Diarylzinc Reagents
作者:Paul Knochel、Guillaume Dunet
DOI:10.1055/s-2007-980344
日期:2007.6
Functionalized diarylzinc reagents react readily with allylic chlorides or phosphates in the presence of Co(acac)2 (10 mol%) to give the SN2 products in high yields and with retention of the double-bond configuration. Functionalities like ester, ketone, or cyano are tolerated.
Regio-controlled Prenylation and Geranylation of 3-Furylmethylmagnesium Bromide. Selective Syntheses of 3-Substituted Furanoid and 2-Substituted 3-Methylfuranoid Terpenes
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1246/bcsj.56.1446
日期:1983.5
main products. When the reactions were carried out in the presence of a catalytic amount of copper(I) iodide, normal coupling occurred and 3-substituted furans, perillene and dendrolasin, were formed in good yields. The related naturally occurring 3-substitutedthiophene, 3-(4-methyl-3-pentenyl)thiophene, was also synthesized from 3-thienylmethylmagnesium bromide and prenyl diethy phosphate.
Copper-catalyzed reactions of organotitanium reagents. Highly selective SN2′-allylation and conjugate addition
作者:Masayuki Arai、Bruce H. Lipshutz、Eiichi Nakamura
DOI:10.1016/0040-4020(92)80022-8
日期:1992.7
the presence of a catalytic amount of CuI·2LiCl, alkyltitanium (RTi(O-i-Pr)3) and titanate reagents (RnTi(O-i-Pr)5−nLi) undergo highlyselectiveSN2′-alkylation reactions with allylic chlorides and allylic diethylphosphates in high yields. The regioselectivity of the reaction is as high as 99.8%. The reaction proceeds with excellent anti-stereoselectivity with respect to the nucleophile and the leaving
在催化量的CuI·2LiCl存在下,烷基钛(RTi(Oi-Pr)3)和钛酸酯试剂(R n Ti(Oi-Pr)5−n Li)进行高度选择性的S N 2'-烷基化反应,烯丙基氯化物和烯丙基磷酸二乙酯的收率很高。反应的区域选择性高达99.8%。反应的进行具有优异的抗-stereoselectivity相对于亲核试剂和离去基团,表现出高的1,2-反-diastereoselectivity与δ手性烯丙基氯。催化铜试剂还是在Me 3存在下将烷基转移至烯酮的缓和剂氯化硅。烷基钛基催化试剂选择性地与烯丙基磷酸盐而不是与烯酮反应,而在硅活化剂的存在下,它优先与烯酮而不是与磷酸盐反应。Me 2 CuLi和TiCl(Oi-Pr)3的混合物的1 H NMR研究提供了有关试剂组成的信息。
Palladium(0)-catalyzed carbonylation of allyl phosphates and allyl acetates. Selective synthesis of β,γ-unsaturated esters
Palladium catalyzed carbonylations of allyl phosphates and allyl acetates give β,γ-unsaturated esters efficiently. The latter reaction requires bromide ion as a co-catalyst.