One-Pot Three-Component Catalytic Synthesis of Fully Substituted Pyrroles from Readily Available Propargylic Alcohols, 1,3-Dicarbonyl Compounds and Primary Amines
作者:Victorio Cadierno、José Gimeno、Noel Nebra
DOI:10.1002/chem.200701132
日期:——
preparation of fully substituted pyrroles, from readily accessible secondary propargylic alcohols, 1,3-dicarbonylcompounds and primary amines, has been developed. The one-pot multicomponent reaction, which is catalysed by the system [Ru(eta(3)-2-C(3)H(4)Me)(CO)(dppf)][SbF(6)]/CF(3)CO(2)H (dppf: 1,1'-bis(diphenylphosphanyl)ferrocene), involves initial propargylation of the 1,3-dicarbonylcompound promoted by
Highly stereoselective kinetic resolution of α-allenic alcohols: an enzymatic approach
作者:Wenhua Li、Zuming Lin、Long Chen、Xuechao Tian、Yan Wang、Sha-Hua Huang、Ran Hong
DOI:10.1016/j.tetlet.2015.12.098
日期:2016.2
A highly efficient lipase AK-catalyzed direct kinetic resolution of a variety of α-allenic alcohols was developed. With the complementary to previous studies, the current reaction system is effective on a broad range of substituents (R1) at C(1), such as alkyl, aryl, alkenyl, and alkynyl groups. The Jones–Burgess empirical model was modified to interpret the reversed selectivity during the acetylation
Enantioselective Propargylation of Polyols and Desymmetrization of <i>meso</i>
1,2-Diols by Copper/Borinic Acid Dual Catalysis
作者:Ren-Zhe Li、Hua Tang、Ke R. Yang、Li-Qiang Wan、Xia Zhang、Jie Liu、Zhengyan Fu、Dawen Niu
DOI:10.1002/anie.201703029
日期:2017.6.12
A copper/borinic acid dual catalytic reaction enabled the enantioselective propargylation of aliphatic polyols. Readily available reagents and catalysts were used in this transformation, which displayed good to excellent chemo‐ and stereoselectivity for a broad array of substrates. The method was also applicable to the desymmetrization of meso 1,2‐diols to furnish products with three stereogenic centers
Allenylidene Induced 1,2‐Metalate Rearrangement of Indole‐Boronates: Diastereoselective Access to Highly Substituted Indolines
作者:Amit Kumar Simlandy、M. Kevin Brown
DOI:10.1002/anie.202103108
日期:2021.5.25
A process to achieve 1,2‐metalate rearrangements of indole boronate as a way to access substitutedindolines in high diastereoselectivities is presented. The reaction involves the generation of a Cu–allenylidene, which is sufficiently electrophilic to induce the 1,2‐metalate rearrangement. The scope of the reaction is evaluated as well as further transformations of the product.
with azomethineimines has successfully been developed under mild reaction conditions, affording biologically interesting tetrahydropyrazoloisoquinoline derivatives in high to excellent yields and with excellent stereoselectivity. The reaction follows a tandem [3+2] cycloaddition/allylation/elimination of AcOH pathway. Allenyl carbinol acetates also reacted well with in situ generated azomethine imine