SYNTHESIS OF 2-ALKENYL-4H-3, 1-BENZOXAZIN-4 -ONE UNDER ACIDIC AND BASIC MEDIA

ABSTRACT Direct one pot synthesis of 4H-3, 1-benzoxazin-4-ones bearing vinyl substituents at C-2 position by two different and straightforward methods is described. The salient features of this method include a simple procedure, mild conditions, easy purification inexpensive and availability of starting materials and high yields

Lanthanum(III) chloride/chloroacetic acid as an efficient and reusable catalytic system for the synthesis of new 1-((2-hydroxynaphthalen-1-yl)(phenyl)methyl)semicarbazides/thiosemicarbazides

A one-pot, multi-component coupling reaction of aromatic aldehydes, 2-naphthol and semicarbazide (hydrochloride)/thiosemicarbazide using LaCl3/ClCH2COOH as an efficient catalyst system under solvent free condition at elevated temperature was investigated. High yields, short reaction time, easy work-up, green environment which requires no toxic organic solvents and reusability of the catalyst are the advantages of this procedure

Facile and rapid synthesis of divers xanthene derivatives using lanthanum(III) chloride/chloroacetic acid as an efficient and reusable catalytic system under solvent-free conditions

LaCl3/ClCH2COOH was used as an efficient, and recyclable catalytic system for synthesis of 11H-benzo[a]xanthene-11-one, hexahydro-1H-xanthene- 1,8(2H)-dione and 11-aryl-10H-diindeno[1,2-b:2′,1′-e]pyran-10,12(11H)-dione derivatives via a one-pot three-component reaction of aldehydes, 2-naphthol, and cyclic 1,3-dicarbonyl compounds. The reactions proceeded rapidly at 70°C under solvent-free conditions and the desired products were obtained in good to excellent yields