Brønsted Base and Lewis Acid Cooperatively Catalyzed Asymmetric exo′-Selective [3 + 2] Cycloaddition of Trifluoromethylated Azomethine Ylides and Methyleneindolinones

2020 ◽  
Vol 22 (7) ◽  
pp. 2527-2531 ◽  
Author(s):  
Yang Yi ◽  
Yuan-Zhao Hua ◽  
Hui-Jie Lu ◽  
Lan-Tao Liu ◽  
Min-Can Wang
Keyword(s):  
Lewis Acid ◽  
Azomethine Ylides ◽  
Brønsted Base

Direct Mannich-Type Reactions Promoted by Frustrated Lewis Acid/Brønsted Base Catalysts

2016 ◽  
Vol 55 (44) ◽  
pp. 13877-13881 ◽  
Author(s):  
Jessica Z. Chan ◽  
Wenzhi Yao ◽  
Brian T. Hastings ◽  
Charles K. Lok ◽  
Masayuki Wasa
Keyword(s):  
Lewis Acid ◽  
Base Catalysts ◽  
Brønsted Base

Dinuclear Zinc-Catalyzed Enantioselective Formal [3+2] Cycloaddition of N-2,2,2-Trifluoroethylisatin Ketimines with Low Reactive Aurone Derivatives

2021 ◽  
Author(s):  
Rui-Li Wang ◽  
Shi-Kun Jia ◽  
Ya-Jun Guo ◽  
Yang Yi ◽  
Yuan-Zhao Hua ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Brønsted Base ◽  
Derivatives Of

Highly enantioselective formal [3+2] cycloaddition of N-2,2,2-trifluoroethylisatin ketimines with aurone derivatives of low reactivity by chiral dinuclear zinc catalysts has been developed via a Brønsted base and Lewis acid cooperative...

Dinuclear zinc-catalyzed asymmetric [3+2] cyclization reaction for direct assembly of chiral α-amino-γ-butyrolactones bearing three stereocenters

2021 ◽  
Author(s):  
Wen-Peng Yang ◽  
Shi-Kun Jia ◽  
Tian-Tian Liu ◽  
Yuan-Zhao Hua ◽  
Mincan Wang
Keyword(s):  
Lewis Acid ◽  
Cyclization Reaction ◽  
Activation Model ◽  
Direct Assembly ◽  
Brønsted Base ◽  
Cooperative Activation

An efficient enantioselective [3+2] cyclization reaction of α-hydroxy-1-indanones and alkylidene azlactones has been developed with chiral dinuclear zinc catalysts via a Brønsted base and Lewis acid cooperative activation model. This...

Highly effective Brønsted base/lewis acid cooperative catalysis: a new Cd metal–organic framework for the synthesis of Hantzsch 1,4-DHPs at ambient temperature

2017 ◽  
Vol 41 (24) ◽  
pp. 15475-15484 ◽  
Author(s):  
Farzaneh Rouhani ◽  
Ali Morsali
Keyword(s):  
Ambient Temperature ◽  
Lewis Acid ◽  
Functional Group ◽  
Metal Organic Framework ◽  
Cooperative Catalysis ◽  
Highly Effective ◽  
Metal Organic ◽  
Brønsted Base ◽  
Organic Framework

A new 3D metal–organic framework {[Cd3(BDC)3(OPP)(DMF)2]·2DMA}n (TMU-33) has been synthesized. The performance of the imine functional group of the OPP ligand as a Brønsted base and open Cd site as a Lewis acid in this framework was investigated as cooperative catalyst.

Cyanation ofN-Acylhydrazones with Trimethylsilyl Cyanide Promoted by a Brønsted Base and a Lewis Acid

2005 ◽  
Vol 347 (15) ◽  
pp. 1899-1903 ◽  
Author(s):  
Hideyuki Konishi ◽  
Chikako Ogawa ◽  
Masaharu Sugiura ◽  
Shū Kobayashi
Keyword(s):  
Lewis Acid ◽  
Trimethylsilyl Cyanide ◽  
Brønsted Base

scholarly journals Tandem catalysis with a bifunctional site-isolated Lewis acid–Brønsted base metal–organic framework, NH2-MIL-101(Al)

2012 ◽  
Vol 48 (95) ◽  
pp. 11650 ◽  
Author(s):  
Renganathan Srirambalaji ◽  
Soonsang Hong ◽  
Ramalingam Natarajan ◽  
Minyoung Yoon ◽  
Raghunandan Hota ◽  
...  
Keyword(s):  
Base Metal ◽  
Lewis Acid ◽  
Metal Organic Framework ◽  
Tandem Catalysis ◽  
Metal Organic ◽  
Brønsted Base ◽  
Organic Framework

Asymmetric Brønsted Base Catalyzed and Directed [3+2] Cycloaddition of 2-Acyl Cycloheptatrienes with Azomethine Ylides

2016 ◽  
Vol 22 (10) ◽  
pp. 3259-3263 ◽  
Author(s):  
Vibeke H. Lauridsen ◽  
Lise Ibsen ◽  
Jakob Blom ◽  
Karl Anker Jørgensen
Keyword(s):  
Azomethine Ylides ◽  
Brønsted Base

Direct Mannich-Type Reactions Promoted by Frustrated Lewis Acid/Brønsted Base Catalysts

2016 ◽  
Vol 128 (44) ◽  
pp. 14081-14085 ◽  
Author(s):  
Jessica Z. Chan ◽  
Wenzhi Yao ◽  
Brian T. Hastings ◽  
Charles K. Lok ◽  
Masayuki Wasa
Keyword(s):  
Lewis Acid ◽  
Base Catalysts ◽  
Brønsted Base

scholarly journals Reagent-controlled regiodivergent intermolecular cyclization of 2-aminobenzothiazoles with β-ketoesters and β-ketoamides

2017 ◽  
Vol 13 ◽  
pp. 2739-2750 ◽  
Author(s):  
Irwan Iskandar Roslan ◽  
Kian-Hong Ng ◽  
Gaik-Khuan Chuah ◽  
Stephan Jaenicke
Keyword(s):  
Lewis Acid ◽  
Acid Catalyst ◽  
Nucleophilic Attack ◽  
Carbonyl Groups ◽  
Radical Initiator ◽  
Intermolecular Cyclization ◽  
Lewis Acid Catalyst ◽  
Brønsted Base

Two regiodivergent approaches to intermolecular cyclization of 2-aminobenzothiazoles with β-ketoesters and amides have been developed, controlled by the reagents employed. With the Brønsted base KOt-Bu and CBrCl3 as radical initiator, benzo[d]imidazo[2,1-b]thiazoles are synthesized via attack at the α-carbon and keto carbon of the β-ketoester moiety. In contrast, switching to the Lewis acid catalyst, In(OTf)3, results in the regioselective nucleophilic attack at both carbonyl groups forming benzo[4,5]thiazolo[3,2-a]pyrimidin-4-ones instead.

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