Water → HCID 86745919, compound

Participants

Reaction Conditions

Reaction Steps

To a vigorously stirred solution of the (20S)-4,5-epoxy-21-hydroxy-20-methylpregnan-3-one acetate (3.0 g, 7.72 mmole) obtained in the preceding example, in dimethyl sulfoxide (100 mL), there was added sodium azide (8.2 g) and then concentrated sulfuric acid (0.55 mL). The mixture was heated at 60° C. for 1.5 hours and the cooled mixture was poured into cold water (700 mL). After stirring for 30 minutes, the solids were collected by filtration, washed with water and dried by suction. The resulting solid was purified by flash chromatography on silica gel to give (20S)-4-azido-21-hydroxy-20-methylpregn-4-en-3-one acetate as a white solid (1.6 g, 50.1%), melting at 137°-138° C., with decomposition, after recrystallization from aqueous acetone. IR 2120, 1736, 1670, 1588 (m), 1254 cm-1 ; MS (CI) 386 (3%, M +1 --N2), 326 (100%, M+ 1--N2 --AcOH); 1H NMR (CDCl3) δ 0.72 (3H, s, C18 --Me), 1.01 (d, C22 --Me), 1.14 (s, C19 --Me), 2.06 (s, Ac-Me), 3.02 (1H, dq, C6 --H), 3.77 (1H, dd, 1/2 C21 --CH2), 4.08 (1H, dd, 1/2 C21 --CH2).

Provenance & Evidence