Process for preparing 2-alkyl-3-aroyl-5-nitro-benzofurans

Details Process for preparing 2-alkyl-3-aroyl-5-nitro-benzofurans Process for preparing 2-alkyl-3-aroyl-5-nitro-benzofurans

C - Chemistry, Metallurgy

07

D

C07D 307/80 (2006.01) C07C 49/76 (2006.01)

Patent

CA 2737092

The present invention relates to a process for the preparation of a compound of formula (I), wherein R1 is selected from C1-6-alkyl, C3-6-cycloalkyl and aralkyl, and wherein R2 at each occurrence independently is halogen or C1-6-alkyl, and m is an integer from 0 to 4, Q is selected from halogen, -NO2 and -NR3R4, wherein R3 and R4 are independently selected from hydrogen, C1-6-alkyl, C3-6-cycloalkyl, aryl, aralkyl, mesyl and tosyl, or wherein R3 and R4 together form a C4-6-alkylene group, Y at each occurrence is hydrogen or a hydroxy protection group W that can be hydrolytically cleaved under acidic conditions, and n is an integer from 1 to 3, and n is an integer from 1 to 3, with the proviso that n and m together are not greater than 5.

La présente invention concerne un procédé de préparation d'un composé de formule (I), où R1 est choisi parmi C1-6-alkyle, C3-6-cycloalkyle et aralkyl et où R2 est indépendamment à chaque occurrence halogène ou C1-6-alkyle, m étant un entier 0 to 4, Q étant un halogène, -NO2 et -NR3R4, où R3 et R4 étant choisis indépendamment parmi hydrogène, C1-6-alkyle, C3-6-cycloalkyle, aryle, aralkyle, mésyle et tosyle, ou où R3 et R4 forment ensemble un groupe C4-6-alkylène, Y étant à chaque occurrence hydrogène ou un groupe de protection hydroxy W pouvant être décomposé par hydrolyse en milieu acide, n étant un entier compris entre 1 et 3, à la condition que la somme de n et m ne soit pas supérieure à 5.

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