反应详情

A solution of 4-isopropoxy-3-methylbenzoic acid (31.0 mg, 0.161 mmol) and O-(7-azabenzotriazol-1-yl)-N,N,N,N′-tetramethyluronium hexafluorophosphate (61.3 mg, 0.161 mmol) in acetonitrile was treated with triethylamine (67 μL, 0.48 mmol) and stirred for 5 min. 8-Benzyl-9,9-dimethyl-11-oxa-3,8-diazaspiro[5.5]undecane hydrochloride (56.0 mg, 0.161 mmol) was added and the reaction mixture stirred for 3 h. The reaction mixture was filtered and concentrated in vacuo. The crude material was purified by chromatography (0-80% of ethyl acetate/hexanes) to provide (8-benzyl-9,9-dimethyl-11-oxa-3,8-diazaspiro[5.5]undecan-3-yl)-(4-isopropoxy-3-methyl-phenyl)methanone (51.0 mg, 70%) as colorless oil. ESI-MS m/z calc. 450.6. Found 451.3 (M+1)+; Retention time: 1.54 minutes (3 min run).

1. stirringthe reaction mixture stirred for 3 h
2. filtrationThe reaction mixture was filtered
3. concentrationconcentrated in vacuo
4. customThe crude material was purified by chromatography (0-80% of ethyl acetate/hexanes)