CuCl-Catalyzed cycloisomerization reaction of 1,2-allenyl carboxylic acids. A cost-effective synthesis of β-unsubstituted butenolides
摘要:
Fourteen examples of 2,3-butadienoic acids were synthesized according to the known procedures and their high-yielding CuCl-catalyzed cycloisomerization reaction to afford butenolides were described. (C) 2001 Elsevier Science Ltd. All rights reserved.
Palladium Acetate-Catalyzed Cyclization Reaction of 2,3-Allenoic Acids in the Presence of Simple Allenes: An Efficient Synthesis of 4-(1‘-Bromoalk-2‘(<i>Z</i>)-en-2‘-yl)furan-2(5<i>H</i>)-one Derivatives and the Synthetic Application
作者:Zhenhua Gu、Xinke Wang、Wei Shu、Shengming Ma
DOI:10.1021/ja072790j
日期:2007.9.1
We have realized a cyclizationreaction of 2,3-allenoicacids 1 in the presence of simple alkyl- or aryl-substituted allenes 3. In this reaction, the cyclic oxypalladation of 2,3-allenoicacid with Pd(II) would afford the furanonyl palladium intermediate 2, which could be trapped by the simple allene to afford a pi-allylic intermediate anti-9. This intermediate anti-9 could be nucleophilically attacked
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.
Pd(II)-Catalyzed Coupling Cyclization of 2,3-Allenoic Acids with Allylic Halides. An Efficient Methodology for the Synthesis of β-Allylic Butenolides
作者:Shengming Ma、Zhanqian Yu
DOI:10.1021/jo034511q
日期:2003.8.1
An effective method for the synthesis of beta-allyl polysubstituted butenolides from the easily available allylic halides and 2,3-allenoicacids is described. By using this method optically active butenolides can be obtained. According to the results presented in this paper, the reaction may proceed via three consecutive steps: cyclic oxypalladation of the allene, insertion of the C=C bond in allylic
Studies on Thermal Reactivity of β-(1,2-Allenyl)butenolides and 2-Allyl-3-allenylcyclohex-2-enones
作者:Zhenhua Gu、Shengming Ma
DOI:10.1002/chem.200701171
日期:2008.3.7
A series of thermal pericyclic reactions of beta-allenylfuranones have been studied. It was observed that beta-allenylfuranones would undergo 1,5-hydrogen shift to afford a new type of trienes upon heating. Due to their high reactivity, these trienes would undergo subsequent pericyclic reactions based on the nature of the substituent group R: When R is an alkyl group, the intermediate 4a or 4b would
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