Phosphorus oxychloride → 6-Chloro-8-[5-(3-cyclobutyl-3-aza bicyclo[3.1.0]hex-6-yl)-[1,3,4]oxadiazol-2-yl]chroman-5-ylamine

Participants

Reaction Steps

To 3-cyclobutyl-3-aza bicyclo[3.1.0]hexane-6-carboxylic acid (74 mg, 0.40 mmol, obtained in preparation 8) was added phosphoryl chloride (1 mL). The mixture was stirred for 15 minutes and 5-amino-6-chloro chroman-8-carboxylic acid hydrazide (80 mg, 0.33 mmol) was added. The reaction mixture was gradually heated to reflux for 1 hour. The reaction mixture was cooled to room temperature, triturated with hexanes (2×20 mL) and the crude mass was basified with aqueous sodium bicarbonate solution. The basified mixture was extracted with 10% methanol in dichloromethane The organic layer was dried over anhydrous sodium sulphate and the solvent was removed under reduced pressure and was purified by silica gel column to obtain 6-chloro-8-[5-(3-cyclobutyl-3-aza bicyclo[3.1.0]hex-6-yl)-[1,3,4]oxadiazol-2-yl]chroman-5-yl amine (18 mg).

Provenance & Evidence