Asymmetric synthesis of 1-alkynylcyclopropane-1-carboxylates
摘要:
Dirhodium tetrakis(S-(N-dodecylbenzenesulfonyl)prolinate)(Rh2S-DOSP4) catalyzed decomposition of methyl alkynyldiazoacetates in the presence of alkenes results in highly diastereoselective and enantioselective cyclopropanations. (C) 2000 Published by Elsevier Science Ltd.
Asymmetric synthesis of 1-alkynylcyclopropane-1-carboxylates
摘要:
Dirhodium tetrakis(S-(N-dodecylbenzenesulfonyl)prolinate)(Rh2S-DOSP4) catalyzed decomposition of methyl alkynyldiazoacetates in the presence of alkenes results in highly diastereoselective and enantioselective cyclopropanations. (C) 2000 Published by Elsevier Science Ltd.
Studies on the Base-Promoted Conversion of Conjugated Alkynyl Esters to α-Substituted α-Allenyl Esters
作者:Salvatore D. Lepore、Yuanjun He、Pamela Damisse
DOI:10.1021/jo0487754
日期:2004.12.1
variety of conjugated alkynyl esters to α-substituted conjugated allenyl esters (racemic) through the use of strong amide bases. Substantially improved yields over typical enolate formation conditions were observed with the use of 2 equiv of lithium diisopropylamide. Trapping studies indicate that the second equivalent of base likely leads to the dianion intermediate, which upon addition of methyl iodide
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