p-Toluenesulfonic acid monohydrate → 4-Toluenesulfonic acid 3-(4-chlorobenzyl)-1-methyl-2-oxo-cyclopentylmethyl ester

Participants

Reaction Conditions

Reaction Steps

To 521 mg of Compound 3-1-2 synthesized in Production Example 3, 256 mg of 4-toluenesulfonic acid monohydrate and 32.3 μl of water were added, and the resulting mixture was stirred at 80° C. for 38.5 hours. After the reaction, water was added to the reaction solution thus obtained, and extraction with ethyl acetate was then carried out. The extract was washed with an aqueous solution of sodium hydrogen carbonate and saturated brine. After the organic layer was dried over anhydrous sodium sulfate, the solvent was distilled away. The residue was purified by silica gel column chromatography to obtain 361.1 mg of Compound 4-1-2.

Provenance & Evidence