Radical Allylation, Vinylation, Alkynylation, and Phenylation Reactions of α-Halo Carbonyl Compounds with Organoboron, Organogallium, and Organoindium Reagents
reactions of α-halo carbonyl compounds with alkenylindium proceeded via a radical process in the presence of triethylborane. Unactivated alkene moieties and styryl groups were introduced by this method. The carbon-carbon double bond geometry of the alkenylindiums was retained during the alkenylation. Preparation of an alkenylindium via a hydroindation of 1-alkyne and subsequent radical alkenylation established
Selective One-Pot Synthesis of Allenyl and Alkynyl Esters from β-Ketoesters
作者:Pradip Maity、Salvatore D. Lepore
DOI:10.1021/jo801563x
日期:2009.1.2
β-ketoesters to generate conjugated and deconjugated alkynyl esters and conjugated allenyl esters. This sequential one-pot method involves the formation of a vinyl triflate monoanion intermediate that leads to the selective formation of alkynes or allenes depending on additives and conditions used. Product outcomes appear to be a function of unique mono- and dianion mechanisms which are described.
Asymmetric Multicomponent Reactions for Efficient Construction of Homopropargyl Amine Carboxylic Esters
作者:Sifan Yu、Ruyu Hua、Xiang Fu、Gengxin Liu、Dan Zhang、Shikun Jia、Huang Qiu、Wenhao Hu
DOI:10.1021/acs.orglett.9b02139
日期:2019.7.19
Developing an efficient and highly enantioselective protocol to access homopropargyl amines is of high interest to the synthetic community and also remains a formidable challenge for organic chemists. Here, we present integrated Rh2(OAc)4- and BINOL-derived chiral phosphoric acid cooperativelycatalyzed three-component reactions of alkynyldiazoacetates, imines with various nucleophiles including alcohols
Regioselective [3 + 2] Cycloaddition Reaction of 3-Alkynoates with Seyferth–Gilbert Reagent
作者:Yu-Ting Tian、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.joc.0c02957
日期:2021.2.19
A Et3N-triggered regioselective [3 + 2] cycloaddition reaction of 3-alkynoates with Seyferth–Gilbert reagent has been developed to furnish a series of trisubstituted pyrazole-3-phosphonates. A one-pot cycloaddition/alkylation sequence further offered access to the corresponding fully substituted pyrazoles.