Water → HCID 22914677, compound

Participants

Reaction Steps

Methyl 1-Boc-4-(2-hydroxymethylphenylamino)-3-piperidine carboxylate from Step 2 above (4.1 g, 11.3 mmol) was stirred in THF (40 mL) in an ice bath and treated with triphosgene (1.11 g, 3.74 mmol) followed by triethylamine (4.7 mL, 3.41 g, 33.7 mmol). The mixture was stirred at ambient temperature for 18 h, then treated with an additional 0.47 g of triphosgene and 1.9 mL of triethylamine, and stirred an additional 4.5 h. Water was added and the mixture was extracted with ethyl acetate. The combined ethyl acetate layers were washed with 2N HCl then with saturated aqueous sodium bicarbonate, dried over sodium sulfate, filtered, and evaporated to dryness in vacuo. The residue was chromatographed on silica gel eluted with CHCl3 followed by 1:99 MeOH:CHCl3. The combined product fractions were evaporated to dryness in vacuo to give methyl 1-Boc-4-(3,1-benzoxazin-2-one-1-yl)-3-piperidine carboxylate.

Provenance & Evidence