Tong-Shou Jin

An efficient and convenient procedure for the preparation of 1,1-diacetates from aldehydes catalyzed by H2NSO3H

A facile and efficient synthesis of 1,1-diacetates from aldehydes with acetic anhydride has been carried out in excellent yield in the presence of H2NSO3H.

Solid‐State Condensation Reactions Between Aldehydes and 5,5‐Dimethyl‐1,3‐cyclohexanedione by Grinding at Room Temperature

Abstract An efficient and convenient approach to the synthesis of the two different products from aldehydes and 5,5‐dimethyl‐1,3‐cyclohexanedione in the solid state by grinding is described. This method provides several advantages such as environmental friendliness, high yields, and simple workup procedure.

p-TOLUENESULFONIC ACID-CATALYZED EFFICIENT SYNTHESIS OF DIHYDROPYRIMIDINES: IMPROVED HIGH YIELDING PROTOCOL FOR THE BIGINELLI REACTION

ABSTRACT Dihydropyrimidines are prepared by a one-pot cyclocondensation of aldehydes, β-ketoesters and urea with p-toluenesulfonic acid-catalyzed condensation reaction. Yields are significantly higher than utilizing classical Biginelli reaction conditions.

Sulfamic Acid Catalysed Acetylation of Alcohols and Phenols with Acetic Anhydride

Abstract An easy acetylation of alcohols and phenols with acetic anhydride has been carried out in excellent yield under catalysis of sulfamic acid.

Clean, one-pot synthesis of naphthopyran derivatives in aqueous media

Abstract A general and practical one‐pot synthesis of naphthopyran derivatives using hexadecyltrimethylammonium bromide (HTMAB) as catalyst (10 mol%) is described. This method provides several advantages such as neutral conditions, high yields and simple workup procedure. The catalyst is low cost, facile, active, environmentally friendly, and reusable. In addition, water is chosen as a green solvent.

AN EFFICIENT AND FACILE PROCEDURE FOR THE DEPROTECTION OF 1,1-DIACETATES CATALYSED BY EXPANSIVE GRAPHITE

Abstract A rapid, efficient and high yield method for the deprotection of 1,1-diacetates is described which occurs under catalysis of expansive graphite in refluxing dichloromethane or benzene.

A Clean and Simple Synthesis of 6‐Amino‐4‐Aryl‐5‐Cyano‐3‐Methyl‐1‐Phenyl‐1,4‐Dihydropyrano[2,3‐c]Pyrazole in Water

Abstract A simple and clean method for producing 6‐amino‐4‐aryl‐5‐cyano‐3‐methyl‐1‐phenyl‐1,4‐ dihydropyrano[2,3‐c]pyrazole from aromatic aldehyde, malononitrile and 3‐methyl‐1‐phenyl‐ 2‐pyrazolin‐5‐one catalyzed by hexadecyltrimethylammonium bromide (HTMAB) in water is described. This method provides several advantages such as mild reaction conditions, simple workup procedure, and being environmentally friendly.

An Efficient and Convenient Procedure for Preparation of 1,1-Diacetates from Aldehydes Catalysed by Expansive Graphite

Abstract An easy preparation of 1,1-diacetates from aldehydes has been carried out in excellent yield under catalysis of expansive graphite at room temperature.

A clean one-pot synthesis of 7-amino-5-aryl-6-cyano-1,5-dihydro-2h-pyrano[2,3-d] pyrimidine-2,4(3H)-diones in aqueous media under ultrasonic irradiation

A novel approach to the synthesis of 7-amino-5-aryl-6-cyano-1,5-dihydro-2H-pyrano[2,3-d]pyrimidine-2,4(3H)-diones in aqueous media under ultrasonic irradiation without catalyst is described. This method provides several advantages such as being environmentally friendly, simple work-up procedure and milder condition. In addition, water was chosen as a green solvent.

Transesterification of β-ketoesters with alcohols catalyzed by montmorillonite K-10

Montmorillonite K-10 is an efficient reusable catalyst for the transesterification of ethyl/methyl β-ketoesters with various alcohols in good yields. The main advantages of the catalyst are easy operation in the workup and a more economical and environmentally benign procedure.