8-(2-octylcyclopropyl)octanoic acid

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 3.0 g of dihydrosterculic acid* in 75 ml methylene chloride cooled to -20°, is added dropwise 1.1 g triethyl amine and then dropwise 1.1 g ethyl chloroformate. The reaction mixture is allowed gradually to come to room temperature and stirred for 2 hours. There is then added 1.0 g triethylamine followed by 1.6 g o-methylphenyl hydrazine hydrochloride and the reaction mixture then stirred for 16 hours. Thereafter the reaction mixture is extracted five times with portions of 2 N hydrochloric acid, then once with 2 N aqueous sodium hydroxide and washed extensively with saturated aqueous sodium chloride. The organic phase is then dried over anh. sodium sulphate, filtered and the filtrate evaporated i.v. to dryness to obtain a residue. The residue is then chromatographed over silica gel, with chloroform as the eluent. The desired fractions** are combined and evaporated i.v. to dryness to yield the title product as a waxy solid, NMR; b +0.65(3), b -0.3(1), d 8.0(1), d 6.1(1), s 2.1(3). to come to room temperature the reaction mixture then stirred for 16 hours Thereafter the reaction mixture is extracted five times with portions of 2 N hydrochloric acid once with 2 N aqueous sodium hydroxide and washed extensively with saturated aqueous sodium chloride The organic phase is then dried over anh. sodium sulphate filtered the filtrate evaporated i.v to dryness to obtain a residue The residue is then chromatographed over silica gel, with chloroform as the eluent evaporated i.v