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To a solution of 1,3-cyclohexanedicarboxylic acid (10 g, 58 mmol) in MeOH (50 mL) was added conc. H2SO4 (2 mL). Then the mixture was stirred at room temperature for 4 hrs. The mixture was concentrated under reduced pressure, and then partitioned between ethyl acetate and a saturated aqueous NaHCO3 solution. The organic phase was washed with brine, dried over Na2SO4, and evaporated to give dimethyl 1,3-cyclohexanedicarboxylate as a colorless oil (11.6 g, yield; quant.).
REFERENCE EXAMPLE 71 Dimethyl 1,3-cyclohexanedicarboxylate To a diazomethane-ether solution prepared accoding to Arndt's method (Arndt; Org. Synth. Collect Vol. II, 165) from 40.0 g of N-methylnitrosourea were added 11.0 g of 1,3-cyclohexanedicarboxylic acid, and the mixture was stirred at room temperature for 30 minutes. After completion of the reaction, the solvent was distilled off under reduced pressure and the residue was dissolved in ethyl acetate and washed with an aqueous sodium bicarbonate solution and an aqueous sodium chloride solution. After the residue was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure to obtain 8.33 g of the desired compound as a pale yellow oil. NMR spectrum (CDCl3) delta ppm: 1.20-2.40(9.3H,m), 2.62-2.75(0.7H,m), 3.67(6H,m)
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