Isopropanol → 9-(2-furanylmethyl)-N-(4-piperidinyl)-9H-purin-8-amine hemihydrate

Participants

Reaction Steps

A mixture of 60.5 parts of ethyl 4-[[9-(2-furanylmethyl)-9H-purin-8-yl]amino]-1-piperidinecarboxylate, 90 parts of potassium hydroxide, 800 parts of 2-propanol and 20 parts of water was stirred for 48 hours at reflux temperature. The reaction mixture was evaporated. The reaction mixture was poured into water while stirring. The product was filtered off and dried, yielding a first fraction of 36.2 parts of 9-(2-furanylmethyl)-N-(4-piperidinyl)-9H-purin-8-amine hemihydrate. The aqueous phase was extracted with dichloromethane. The organic layer was dried, filtered and evaporated. The oily residue was stirred in acetonitrile and 2,2'-oxybispropane. The product was filtered off and dried, yielding a second fraction of 5.6 parts of 9-(2-furanylmethyl)-N-(4-piperidinyl)-9H-purin-8-amine. Total yield 41.8 parts (86%) of 9-(2-furanylmethyl)-N-(4-piperidinyl)-9H-purin-8-amine hemihydrate; mp. 164.1° C. (compound 33).

Provenance & Evidence