Regioselective Palladium(II)-Catalyzed Synthesis of Five- or Seven-Membered Ring Lactones and Five-, Six- or Seven-Membered Ring Lactams by Cyclocarbonylation Methodology
作者:Bassam El Ali、Kazumi Okuro、Giuseppe Vasapollo、Howard Alper
DOI:10.1021/ja953403l
日期:1996.1.1
affording five- or seven-memberedring lactones (bicyclic, tricyclic, and pentacyclic) as the principal products, often in excellent yields. Use of 2-aminostyrenes as reactants and catalytic quantities of palladium acetate and tricyclohexylphosphine, affords five-membered ring lactams in high yield and selectivity. Bicyclic and tricyclic heterocycles containing six-membered ring lactams can be synthesized
Deoxygenative α-alkylation and α-arylation of 1,2-dicarbonyls
作者:Shengfei Jin、Hang T. Dang、Graham C. Haug、Viet D. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1039/d0sc03118f
日期:——
challenging but synthetically indispensable approach to α-branched carbonyl motifs that are widely represented among drugs, natural products, and synthetic intermediates. Here, we describe a simple approach to generation of boron enolates in the absence of strong bases that allows for introduction of both α-alkyl and α-aryl groups in a reaction of readily accessible 1,2-dicarbonyls and organoboranes. Obviation
A highly efficient and eco-friendly method for the synthesis of 1,3-indandione ring-fused 3-oxindoles bearing two contiguous quaternary stereocenters via an aldol reaction in aqueous media
method for the synthesis of oxindoles featuring two contiguous quaternary carbon centers via an aldol reaction starting from various 3-substituted oxindoles has been established. A wide variety of such featured multi-substituted 1,3-indandione ring-fused 3-oxindole scaffolds were obtained smoothly in good yields (up to 98%) employing the most green of solvents, namely water, as reaction medium. Furthermore
An efficient synthesis of spiro[cyclohexane-1,3′-indol-2′(3′H)-ones]via radical cyclisation
作者:Keith Jones、Mervyn Thompson、Colin Wright
DOI:10.1039/c39860000115
日期:——
Treatment of the o-bromo-N-acryloylanilides (4) with tri-n-butylstannane leads to the formation of 3-substituted- and 3,3-disubstituted-2-oxindoles (5) in high yield.
An Expedient Synthesis of Oxindole Dimers by Direct Oxidative Dimerization of Oxindoles
作者:Hyun Ju Lee、Sangku Lee、Jin Woo Lim、Jae Nyoung Kim
DOI:10.5012/bkcs.2013.34.8.2446
日期:2013.8.20
Oxindole dimers have been used as intermediates in the synthesis of various cyclotryptamine alkaloids. An efficient directsynthesis of oxindole dimers has been carried out from 3-substituted oxindolesvia an oxidative dimerization using manganese(III) acetate or copper acetate/silver acetate system.