Enantioselective Construction of the Biologically Important Cyclopenta[1,4]diazepine Framework Enabled by Asymmetric Catalysis by Chiral Spiro-Phosphoric Acid
作者:Meng Sun、Yang Wang、Lei Yin、Yang-Yan Cao、Feng Shi
DOI:10.1002/ejoc.201501255
日期:2015.12
highest catalytic activity on controlling the enantioselectivity of the three-component tandem reaction. This reaction represents the first catalytic asymmetricconstruction of chiral cyclopenta[1,4]diazepine frameworks with structural diversity. The approach also constitutes the first systematic investigation on this catalytic asymmetricthree-componentreaction, which will enrich the fields of both organocatalysis
Diastereo- and Enantioselective Construction of a Bispirooxindole Scaffold Containing a Tetrahydro-β-carboline Moiety through an Organocatalytic Asymmetric Cascade Reaction
作者:Wei Dai、Han Lu、Xin Li、Feng Shi、Shu-Jiang Tu
DOI:10.1002/chem.201402485
日期:2014.9.1
The first catalytic asymmetric construction of a new class of bispirooxindole scaffold‐containing tetrahydro‐β‐carboline moiety has been established through chiral phosphoric acid‐catalyzed three‐component cascade Michael/Pictet–Spengler reactions of isatin‐derived 3‐indolylmethanols, isatins, and amino‐ester, which afforded structurally complex and diverse bispirooxindoles with one quaternary and
Enantioselective Construction of Spiro[indoline-3,2′-pyrrole] Framework via Catalytic Asymmetric 1,3-Dipolar Cycloadditions Using Allenes as Equivalents of Alkynes
作者:Cong-Shuai Wang、Ren-Yi Zhu、Jian Zheng、Feng Shi、Shu-Jiang Tu
DOI:10.1021/jo502516e
日期:2015.1.2
The first catalyticasymmetric1,3-dipolarcycloadditions (1,3-DCs) of isatin-derived azomethine ylide with allenes have been established, which efficiently assembly isatins, amino-esters and 2,3-allenoate into enantioenriched spiro[indoline-3,2′-pyrrole] derivatives with a quaternary stereogenic center in generally high enantioselectivities (80–98% ee). In this allene-involved 1,3-DC, an unexpected
form, and which are otherwise impossible to access. Mechanistic evidence reveals the presence of an alkylgold intermediate, and an X‐ray crystal structure of the allylgold species illuminates its unique stability and reactivity. An asymmetric formal hetero‐enereaction of this gold intermediate, involving a dearomatization process, is enabled with assistance of a quinine‐derived squaramide catalyst. This
Acetic acid promoted tandem cyclization of in situ generated 1,3-dipoles: stereoselective synthesis of dispiroimidazolidinyl and dispiropyrrolidinyl oxindoles with multiple chiral stereocenters
作者:Koorathota Suman、Sathiah Thennarasu
DOI:10.1039/c5ra17215b
日期:——
Acetic acid catalyzedin situgeneration of ketimine based 1,3-dipoles, and single-step construction of imidazolidine ring with three chiral centers and pyrrolidine ring with four chiral centersviaformation of new C–N and C–C bonds is reported.