Cytosine Palladium Complex Supported on Ordered Mesoporous Silica as Highly Efficient and Reusable Nanocatalyst for One-Pot Oxidative Esterification of Aldehydes

The synthesis of esters is one of the most fundamental and significant subjects in organic chemistry and chemical industry because they are used in high-value products such as cosmetics, biofuel, pharmaceuticals, surfactants, and food ingredients. In this study, an efficient, economic, sustainable, and green protocol for oxidative esterification reaction has been developed. A one-pot direct transformation of aliphatic, aromatic, and unsaturated aldehydes into esters in the presence of oxygen has been carried out over mesoporous organosilica-supported palladium nanocatalyst (Pd-Cyt@SBA-15) under ambient conditions. Pd-Cyt@SBA-15 efficiently catalyzed selectively large-scale conversion of aldehydes into esters in high yields and large turnover numbers (TON = 98,000). Pd-Cyt@SBA-15 nanocatalyst demonstrated excellent reusability and stability and could be recycled up to ten times without loss of significant reactivity. ICP-AES analysis showed that no leaching of active palladium species occurred during the recycling process of the heterogeneous Pd-Cyt@SBA-15 nanocatalyst.

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A highly efficient and green approach for the synthesis of pyrimido[4,5-b]quinolines using N,N-diethyl-N-sulfoethanaminium chloride

Zeitschrift für Naturforschung B ◽

10.1515/znb-2020-0098 ◽

2021 ◽

Vol 76 (2) ◽

pp. 85-90

Author(s):

Abdolkarim Zare ◽

Manije Dianat

Keyword(s):

Reaction Times ◽

Solvent Free ◽

One Pot ◽

Catalyst Amount ◽

Green Protocol ◽

Highly Efficient ◽

Green Approach ◽

Solvent Free Conditions ◽

The One ◽

High Yields

Abstract A highly efficient and green protocol for the synthesis of pyrimido[4,5-b]quinolines has been described. The one-pot multicomponent reaction of dimedone with arylaldehydes and 6-amino-1,3-dimethyluracil in the presence of N,N-diethyl-N-sulfoethanaminium chloride ([Et3N–SO3H][Cl]) as an ionic liquid (IL) catalyst under solvent-free conditions afforded the mentioned compounds in high yields and short reaction times. Our protocol is superior to many of the reported protocols in terms of two or more of these factors: the reaction times, yields, conditions (solvent-free versus usage of organic solvents), temperature and catalyst amount.

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Ultrasound-assisted and trisodium citrate dihydrate-catalyzed green protocol for efficient and one-pot synthesis of substituted chromeno[3′,4′:5,6]pyrano[2,3-d]pyrimidines at ambient conditions

Tetrahedron Letters ◽

10.1016/j.tetlet.2019.06.028 ◽

2019 ◽

Vol 60 (29) ◽

pp. 1904-1908 ◽

Cited By ~ 5

Author(s):

Goutam Brahmachari ◽

Khondekar Nurjamal

Keyword(s):

Trisodium Citrate ◽

Ambient Conditions ◽

One Pot ◽

Green Protocol ◽

One Pot Synthesis ◽

Ultrasound Assisted ◽

Trisodium Citrate Dihydrate

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Microwave-Assisted Three-Component “Catalyst and Solvent-Free” Green Protocol: A Highly Efficient and Clean One-Pot Synthesis of Tetrahydrobenzo[b]pyrans

Organic Chemistry International ◽

10.1155/2014/851924 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

Sougata Santra ◽

Matiur Rahman ◽

Anupam Roy ◽

Adinath Majee ◽

Alakananda Hajra

Keyword(s):

Knoevenagel Condensation ◽

One Pot ◽

Green Protocol ◽

Microwave Assisted ◽

Highly Efficient ◽

One Pot Synthesis ◽

Purification Technique ◽

The One ◽

High Yields ◽

Operational Simplicity

A green and highly efficient method has been developed for the one-pot synthesis of tetrahydrobenzo[b]pyrans via a three-component condensation of aldehydes, 1,3-cyclic diketones, and malononitrile under MW irradiation without using any catalyst and solvent. This transformation presumably occurs by a sequential Knoevenagel condensation, Michael addition, and intramolecular cyclization. Operational simplicity, solvent and catalyst-free conditions, the compatibility with various functional groups, nonchromatographic purification technique, and high yields are the notable advantages of this procedure.

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Water mediated eco-friendly green protocol for one-pot synthesis of α-aminophosphonates at ambient conditions

Journal of Chemical Sciences ◽

10.1007/s12039-014-0608-x ◽

2014 ◽

Vol 126 (3) ◽

pp. 793-799 ◽

Cited By ~ 7

Author(s):

SANTHOSH REDDY MANDHA ◽

MANJULA ALLA ◽

VITTAL RAO BOMMENA

Keyword(s):

Ambient Conditions ◽

One Pot ◽

Green Protocol ◽

One Pot Synthesis

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An efficient synthesis of imidazo[2,1-b][1,3,4]thiadiazol-7-ium hydroxides by a one-pot, three-component reaction in water

Heterocyclic Communications ◽

10.1515/hc-2018-0117 ◽

2018 ◽

Vol 24 (6) ◽

pp. 297-302 ◽

Cited By ~ 1

Author(s):

Jabbar Khalafy ◽

Nasser Etivand ◽

Neda Khalillou

Keyword(s):

Reaction Times ◽

Sulfamic Acid ◽

One Pot ◽

Green Protocol ◽

H Nmr ◽

Three Component Reaction ◽

Ft Ir ◽

High Yields ◽

Reaction In Water ◽

C Nmr

Abstract An improved synthesis of 2-ethyl-5-(2-hydroxy-4-oxoquinolin-3(4H)-ylidene)-6-aryl-5,6-dihydroimidazo[2,1-b][1,3,4]thiadiazol-7-ium hydroxide derivatives 4a–k via the reaction of aryl glyoxal monohydrates 1a–k, quinoline-2,4-diol 2 and 2-amino-[1,3,4]thiadiazole (3) in the presence of Et3N/sulfamic acid in H2O is described. This green protocol is characterized by the use of the readily available catalyst and reactants, short reaction times, operational simplicity and high yields of products. The structures of all compounds were characterized by 1H NMR, 13C NMR and Fourier-transform infrared (FT-IR) spectral data and microanalyses.

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