Chloroform → HCID 58293353、化合物

An optically-active compound of 3-methyl-6-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1,6-diazaspiro[3.4]octane-1-carboxylic acid tert-butyl ester (9.5 g) was mixed with 4M hydrochloric acid-1,4-dioxane (50 ml), chloroform (50 ml) and methanol (100 ml), and the mixture was stirred at 60° C. for 30 minutes. The mixture was concentrated under reduced pressure, and azeotroped with toluene to give the titled compound (9.3 g).