Silver Tetrafluoroborate-Catalyzed Oxa-Diels-Alder Reaction Between Electrically Neutral Dienes and Aldehydes
作者:Xiaodong Zou、Lizheng Yang、Xiangli Liu、Hao Sun、Hongjian Lu
DOI:10.1002/adsc.201500487
日期:2015.10.12
Chemoselective oxa-Diels–Alder reactionsbetween electrically neutral 1,3-dienes and various aldehydes were achieved using the commercially available silver tetrafluoroborate (AgBF4) as catalyst. This catalytic process has high functional group tolerance. Heteroatoms at the β-position of the aryl aldehydes can greatly promote the reactivity of the substrates even with heterocyclic aldehydes that were
The regioselective sila-acylation and silaformylation of 1,3-dienes was achieved over a copper catalyst using a silylborane as a silyl source. β,γ-Unsaturated ketones with a (dimethylphenylsilyl)methyl moiety at the α-position were obtained using esters, while β,γ-unsaturated aldehydes were obtained using formate esters.
AlCl3 catalyzed oxa-Diels-Alder reaction of aromatic aldehydes with simple dienes
作者:Wujun Jian、Bo Qian、Hongli Bao、Daliang Li
DOI:10.1016/j.tet.2016.10.049
日期:2017.7
A highly regioselective and diastereoselective oxa-Diels-Alder reaction catalyzed by AlCl3 has been developed. This reaction is efficient and characterized by good functional group compatibility, F, Cl, CN, NO2, OMe and thiophenyl groups are tolerated. A Lewis acid catalyzed concerted cycloaddition mechanism is proposed based on the results.
Regiodivergent Copper Catalyzed Borocyanation of 1,3-Dienes
作者:Tao Jia、Qiong He、Rebecca E. Ruscoe、Alexander P. Pulis、David J. Procter
DOI:10.1002/anie.201806169
日期:2018.8.27
Coppercatalyzed multi‐functionalization of unsaturated carbon‐carbon bonds is a powerful tool for the generation of complex molecules. We report a regiodivergent process that allows a switch between 1,4‐borocupration and 4,1‐borocupration of 1,3‐dienes upon a simple change in ligand. The subsequently generated allyl coppers are trapped in an electrophilic cyanation to selectively generate densely
Ni-Catalyzed Regioselective Hydroalkoxylation of Branched 1,3-Dienes
作者:Gaël Tran、Clément Mazet
DOI:10.1021/acs.orglett.9b03511
日期:2019.11.15
A highly regioselective Ni-catalyzed hydroalkoxylation of 1,3-dienes is reported. The use of a (P,N) ligand is essential in achieving high levels of selectivity. The optimized protocol operates under particularly mild conditions, it provides access to a broad range of structurallydiverse allylic ethers, and tolerates a number of sensitive functional groups.