Water → HCID 58043125, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of NaH (55-65% disp. in oil, 0.31 g, 7.7 mmol) in dry DMF (10 mL) under nitrogen was cooled by an ice-bath. A solution of 26A (1.0 g, 5.9 mmol) in DMF (10 mL) was added drop-wise over 10 minutes. The mixture was stirred for 30 minutes and then tert-butyl 3-[(methylsulfonyl)oxy]azetidine-1-carboxylate (1.63 g, 6.5 mmol) in DMF (10 mL) was added. The mixture was heated to 80° C. over night and then cooled to RT. Water (100 mL) was added and the mixture was extracted three times with EtOAc (50 mL). The combined organic phases were filtered through a phase separator and the solvent was removed by evaporation. The residue was purified by preparative chromatography on a Kromasil C8 column (10 μm 250×20 ID mm) using a gradient of 10-50% acetonitrile in water/acetonitrile/formic acid (95/5/0.2), 100 mL/min. Fractions were collected, pooled and concentrated in vacuo. DCM was added and the solution was filtered through a phase separator and concentrated by evaporation. There was obtained 1.2 g (55%) of 26B as a solid. 1H NMR (500 MHz, CDCl3): δ 1.45 (s, 9H), 2.58 (s, 6H), 3.90 (s, 2H), 3.95-4.05 (m, 2H), 4.25-4.35 (m, 2H), 4.81-4.92 (m, 1H), 6.45-6.65 (m, 2H), 7.35-7.45 (m, 1H), 8.42 (s, 1H).

Provenance & Evidence