Efficient synthesis of pyrrolo[1,2-a]quinoxalines catalyzed by a Brønsted acid through cleavage of C–C bonds

2016 ◽  
Vol 14 (36) ◽  
pp. 8529-8535 ◽  
Author(s):  
Caixia Xie ◽  
Lei Feng ◽  
Wanli Li ◽  
Xiaojun Ma ◽  
Xinkun Ma ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Domino Reaction ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Efficient Synthesis ◽  
One Pot ◽  
Keto Esters ◽  
Brönsted Acid

An efficient and convenient one-pot domino reaction for the direct synthesis of pyrrolo[1,2-a]quinoxalines has been developed. β-Diketones and β-keto esters are well tolerated to give the corresponding products in moderate to excellent yields.

Brønsted-Acid-Catalyzed Multicomponent One-Pot Reaction: Efficient Synthesis of Polysubstituted 1,2-Dihydropyridines

2017 ◽  
Vol 6 (6) ◽  
pp. 746-750 ◽  
Author(s):  
Yi-Bi Xie ◽  
Si-Pei Ye ◽  
Wei-Feng Chen ◽  
Yu-Lin Hu ◽  
De-Jiang Li ◽  
...  
Keyword(s):  
Bronsted Acid ◽  
Brønsted Acid ◽  
Efficient Synthesis ◽  
One Pot ◽  
Brönsted Acid ◽  
Acid Catalyzed

Cooperative catalysis of N-heterocyclic carbene and Brønsted acid for a highly enantioselective route to unprotected spiro-indoline-pyrans

2015 ◽  
Vol 51 (39) ◽  
pp. 8330-8333 ◽  
Author(s):  
Youqiang Lin ◽  
Limin Yang ◽  
Yue Deng ◽  
Guofu Zhong
Keyword(s):  
Direct Synthesis ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Cooperative Catalysis ◽  
Brönsted Acid

A chiral cooperative catalysis of NHC and Brønsted acid for a formal [4+2] reaction of unprotected isatins and enals was developed for the direct synthesis of unprotected spiro[indoline-3,2′-pyran]-2,6′(3′H)-diones in good to excellent yields (up to 95%) with high enantioselectivities (up to >93% ee).

scholarly journals Brønsted acid-catalyzed metal-free one-pot synthesis of benzimidazoles via [4+1] heteroannulation of ortho-phenylenediamines with β-oxodithioesters

ARKIVOC ◽  
2017 ◽  
Vol 2018 (2) ◽  
pp. 81-89
Author(s):  
Abhijeet Srivastava ◽  
Gaurav Shukla ◽  
Dhananjay Yadav ◽  
Maya Shankar Singh
Keyword(s):  
Bronsted Acid ◽  
Brønsted Acid ◽  
One Pot ◽  
Metal Free ◽  
One Pot Synthesis ◽  
Brönsted Acid ◽  
Acid Catalyzed

Efficient Synthesis of Chromenes from Vinyl o-Quinone Methides via a Brønsted Acid Catalyzed Electrocyclization Process

Synthesis ◽  
2018 ◽  
Vol 50 (12) ◽  
pp. 2416-2422 ◽  
Author(s):  
Man-Su Tu ◽  
Guang-Jian Mei ◽  
Feng Shi ◽  
Si-Jia Liu ◽  
Xiao-Li Jiang ◽  
...  
Keyword(s):  
Efficient Method ◽  
Research Area ◽  
Environmentally Benign ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Efficient Synthesis ◽  
Quinone Methides ◽  
Efficient Approach ◽  
Brönsted Acid ◽  
Acid Catalyzed

An efficient approach for the synthesis of chromene derivatives from vinyl o-quinone methides was established via a Brønsted acid catalyzed electrocyclization. By using this methodology, a series of structurally diversified chromenes was synthesized in a highly atom-economic and environmentally benign manner with generally good to excellent yields (up to 98% yield). This reaction will not only provide an efficient method for the construction of chromene scaffolds, but also enrich the research area of o-quinone methides.

Facile synthesis of chiral indolines through asymmetric hydrogenation of in situ generated indoles

2018 ◽  
Vol 5 (19) ◽  
pp. 2805-2809 ◽  
Author(s):  
Chang-Bin Yu ◽  
Jie Wang ◽  
Yong-Gui Zhou
Keyword(s):  
Asymmetric Hydrogenation ◽  
Hydrogenation Process ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Facile Synthesis ◽  
One Pot ◽  
Brönsted Acid ◽  
Palladium Catalyzed ◽  
Intramolecular Condensation

A concise synthesis of chiral indolines has been developed through intramolecular condensation, deprotection and palladium-catalyzed asymmetric hydrogenation in a one-pot process with up to 96% ee. A strong Brønsted acid played an important role in both the formation of indoles and asymmetric hydrogenation process.

scholarly journals One-Pot Synthesis of 5-Hydroxymethylfurfural from Glucose by Brønsted Acid-Free Bifunctional Porous Coordination Polymers in Water

ACS Omega ◽  
2019 ◽  
Vol 4 (5) ◽  
pp. 9316-9323 ◽  
Author(s):  
Fengbing Liang ◽  
Dawei Chen ◽  
Huizhou Liu ◽  
Weimin Liu ◽  
Mo Xian ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Porous Coordination Polymers ◽  
One Pot ◽  
One Pot Synthesis ◽  
Brönsted Acid

scholarly journals Tartaric Acid–Zinc Nitrate as an Efficient Brønsted Acid-Assisted Lewis Acid Catalyst for the Mannich Reaction

2018 ◽  
Vol 42 (9) ◽  
pp. 463-466 ◽  
Author(s):  
Hao Dong ◽  
Qing Liu ◽  
Yuanyu Tian ◽  
Yingyun Qiao
Keyword(s):  
Tartaric Acid ◽  
Lewis Acid ◽  
Mannich Reaction ◽  
Reaction Times ◽  
Acid Catalyst ◽  
Zinc Nitrate ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
One Pot ◽  
Brönsted Acid

Tartaric acid–zinc nitrate has been found to be an efficient Brønsted acid-assisted Lewis acid catalytic system for the facile synthesis of β-amino carbonyl compounds through the one-pot Mannich reaction of aldehydes, aromatic amines and ketones in ethanol at room temperature. Remarkable enhancement of reactivity by tartaric acid (Brønsted acid) was observed in these reactions in the presence of anhydrous zinc nitrate (Lewis acid), due to coordination of the tartaric acid ligand to zinc ions increasing the acidity of the system. This procedure shows some advantages such as mild reaction conditions, short reaction times and high yields.

One-Pot Hydroxy Group Activation/Carbon-Carbon Bond Forming Sequence Using a Brønsted Base/Brønsted Acid System

2010 ◽  
Vol 352 (17) ◽  
pp. 2881-2886 ◽  
Author(s):  
Alice Devineau ◽  
Guillaume Pousse ◽  
Catherine Taillier ◽  
Jérôme Blanchet ◽  
Jacques Rouden ◽  
...  
Keyword(s):  
Hydroxy Group ◽  
Bronsted Acid ◽  
Acid System ◽  
Brønsted Acid ◽  
One Pot ◽  
Carbon Bond ◽  
Bond Forming ◽  
Carbon Carbon Bond ◽  
Brönsted Acid ◽  
Brønsted Base
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