Process for preparing intermediates for the synthesis of...

Details Process for preparing intermediates for the synthesis of... Process for preparing intermediates for the synthesis of...

C - Chemistry, Metallurgy

07

C

C07C 69/65 (2006.01) C07C 67/347 (2006.01)

Patent

CA 2189128

Disclosed is a process for preparing compounds of formula (I) wherein R is C1- C6 alkyl, comprising heating a mixture of a difluorobenzene derivative, allene, a dialkyl malonate of the formula CH2(CO2R)2, wherein R is C1-C6 alkyl, and a base, in a polar organic solvent in the presence of a catalyst, in a sealed vessel and the pressure within the vessel is 1 to 10 psig.

Procédé de préparation de composés de formule (I) dans lesquels R représente alkyle C¿1?-C¿6?. Selon ce procédé de préparation, on chauffe un mélange comprenant un dérivé de difluorobenzène, de l'allène, un malonate de dialkyle de formule CH¿2?(CO¿2?R)¿2? dans laquelle R représente alkyle C¿1?-C¿6?, et une base, dans un solvant organique polaire et en présence d'un catalyseur, dans une cuve étanche dont la pression interne se situe entre 1 et 10 psig.

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