A Novel Three-Component Reaction of Allenoates, Isocyanides, and Carboxylic Acids: Facile Synthesis of Highly Substituted Acryl Imide Derivatives
作者:Xian Huang、Feng Sha
DOI:10.1021/jo702382h
日期:2008.2.1
A novel synthesis of highly substituted acryl imide derivatives by the three-component reaction of allenoates, isocyanides, and carboxylicacids was reported, and the intramolecular cyclization reaction of allenoic acids with isocyanides was also described.
PdCl<sub>2</sub>-Catalyzed Two-Component Cross-Coupling Cyclization of 2,3-Allenoic Acids with 2,3-Allenols. An Efficient Synthesis of 4-(1‘,3‘-Dien-2‘-yl)-2(5<i>H</i>)-furanone Derivatives
作者:Shengming Ma、Zhenhua Gu
DOI:10.1021/ja0500815
日期:2005.5.1
Cross-coupling cyclization reaction between 2,3-allenoic acids 1 and 2,3-allenols 2, in which two allenes functioned differently, was realized to afford 4-(1',3'-dien-2'-yl)-2(5H)-furanone derivatives3. The reaction may proceed via an oxypalladation, insertion, and beta-hydroxide elimination process. A high E-stereoselectivity of the new formed C=C double bond was observed.
Synthesis of β-halobutenolides and their Pd(0)-catalyzed cross-coupling reactions with terminal alkynes and organozinc reagents. A general route to β-substituted butenolides and formal synthesis of cis-whisky lactone
作者:Shengming Ma、Zhangjie Shi、Zhanqian Yu
DOI:10.1016/s0040-4020(99)00726-7
日期:1999.10
procedure for the efficientsynthesis of β-halobutenolides was developed. The Pd(0)-catalyzed coupling reactions of β-halobutenolides with terminalalkynes or organozinc reagents, i.e., 1-alkenyl, aryl, and alkyl zinc reagents, to afford β-substituted butenolides were carefully studied. Using the coupling protocol of γ-(n-butyl)-β-iodobutenolide with methylzinc halide, we performed an efficient formal synthesis
Reaction of PhSeCl or PhSCl with 2,3-Allenoic Acids: An Efficient Synthesis of β-Organoselenium or β-Organosulfur Substituted Butenolides
作者:Shengming Ma、Feng Pan、Xueshi Hao、Xian Huang
DOI:10.1055/s-2003-43377
日期:——
β-Organoselenium or β-organosulfur-substituted butenolides were prepared via the electrophilic cyclization of 2,3-allenoic acids with PhSeCl or PhSCl.
Efficient Synthesis of 4-(3′-Furanyl)butenolide Derivatives via PdII-Catalyzed Oxidative Heterodimeric Cyclization Reaction of 2,3-Allenoic Acids and 1,2-Allenyl Ketones
作者:Shengming Ma、Zhanqian Yu
DOI:10.1002/chem.200305341
日期:2004.4.19
conveniently through chiral resolution with opticallyactiveamines, that is, cinchonidine or alpha-methyl benzylamine. A mechanistic study showed that the reaction proceeded via a matched double oxypalladation-reductive elimination process. The Pd(II) species may be regenerated via the subsequent cyclometallation of two equivalents of 1,2-allenyl ketones with Pd(0) and protonlysis of Pd enolates formed with the