Indium metal as a reducing agent in organic synthesis
作者:Michael R. Pitts、Justin R. Harrison、Christopher J. Moody
DOI:10.1039/b101712h
日期:——
aromatic nitrocompounds under similar conditions results in selectivereduction of the nitro groups; ester, nitrile, amide and halide substituents are unaffected. Likewise indium in aqueous ethanolic ammonium chloride is an effective method for the deprotection of 4-nitrobenzyl ethers and esters. Indium is also an effective reducing agent under non-aqueous conditions and α-oximino carbonyl compounds can
A nickel-catalyzed cross-coupling of alkenyl methyl ethers with Grignard reagents, undermildconditions, is described. These conditions allowed access to various stilbenes and heterocyclic stilbenic derivatives as well as to a potential anticancer agent DMU-212.
Visible-light-mediated alkylation of 4-alkyl-1,4-dihydropyridines with alkenyl sulfones
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d1ob01806j
日期:——
Herein we report a mild, general protocol for visible-light-mediated alkylation of 4-alkyl-1,4-dihydropyridines with alkenyl sulfones. The protocol permits efficient functionalization of sulfones with a broad range of cyclic and acyclic secondary and tertiary alkyl groups and is scalable to the gram level. Its excellent functional group tolerance and mildness make it suitable for late-stage functionalization
Tunable stereoselective alkene synthesis by treatment of activated imines with nonstabilized phosphonium ylides
作者:De-Jun Dong、Yuan Li、Jie-Qi Wang、Shi-Kai Tian
DOI:10.1039/c0cc04739b
日期:——
A broad range of readily accessible N-sulfonyl imines undergo olefination reaction with nonstabilized phosphoniumylides under mild conditions to afford an array of both Z- and E-isomers of 1,2-disubstituted alkenes, allylic alcohols, and allylic amines in good yields and with greater than 99 : 1 stereoselectivity.
Transition metal promoted reactions. 38. NiCl2(dppe)-catalyzed geminal dialkylation of dithioacetals and trimethylation of ortho thioesters
作者:Yih Ling Tzeng、Ping Fan Yang、Nai Wen Mei、Tien Min Yuan、Chun Chi Yu、Tien Yau Luh
DOI:10.1021/jo00018a016
日期:1991.8
NiCl2(dppe)-catalyzed cross-coupling of cinnamaldehyde dithioacetals gave the corresponding geminal dimethylation products in excellent yields. Allylic ortho thioesters afforded regioselectively the corresponding trimethylation products. The reaction may occur via an 18-electron pi-allyl intermediate, which undergoes facile reductive elimination to afford the geminal dimethylation product. Benzylic dithioacetals having an ortho amino group gave 2-isopropylanilines exclusively. The reaction of benzylic dithioacetals with EtMgBr under the same conditions yielded geminal diethylation products.