Water → Ethyl 1-cyclopropyl-8-(difluoromethoxy)-7-[(1R)-2,3-dihydro-1-methyl-2-(triphenylmethyl)-1H-isoindol-5-yl]-1,4-dihydro-4-oxo-3-quinolinecarboxylate

Participants

Reaction Conditions

Reaction Steps

In a mixed solvent of 50.6 ml of water and 50.6 ml of diethylene glycol dimethyl ether is suspended 13.5 g of 2-[(1R)-1-methyl-2-trityl-2,3-dihydro-1H-5-isoindolyl]-1,3,6,2-dioxazaborocane and to this suspension is added 1.58 ml of acetic acid, after which the resulting mixture is stirred for 30 minutes. To this mixture are further added 10.1 g of ethyl 7-bromo-1-cyclopropyl-8-difluoromethoxy-1,4-dihydro-4-oxoquinoline-3-carboxylate, 5.59 g of sodium carbonate and 0.088 g of bis(triphenylphosphine)-palladium(II) chloride, and the resulting mixture is heated under reflux for 2 hours in a nitrogen atmosphere. The reaction mixture is cooled to 40° C. and thereafter the organic layer is separated. To the organic layer obtained is added 30 ml of ethanol and the crystals deposited are collected by filtration to obtain 17.3 g of ethyl 1-cyclopropyl-8-difluoromethoxy-7-[(1R)-1-methyl-2-trityl-2,3-dihydro-1H-5-isoindolyl]-4-oxo-1,4-dihydro-3-quinolinecarboxylate. The physical property values of this compound were identical with those of the compound obtained in Production Example II-1.

Provenance & Evidence