2,5-Dioxopyrrolidin-1-yl (4-methylbenzyl) carbonate → 4-[(3-Methoxy-pyrazin-2-ylamino)-methyl]-piperidine-1-carboxylic acid 4-methyl-benzyl ester

Participants

Reaction Steps

A mixture of 4-[(3-methoxy-pyrazin-2-ylamino)-methyl]-piperidine (EXAMPLE 127, STEP 3) (0.093 g, 0.00042 mol) and N-(4-methylbenzyloxycarbonyloxy)succinimide (INTERMEDIATE 1A)(118 mg) in DMF (2 mL) was stirred at rt for 18 h. The reaction was diluted with ethyl acetate (30 mL), washed with 10% aqueous sodium bicarbonate (20 mL) followed by brine (10 mL), concentrated in vacuo and chromatographed on silica using a gradient elution of 5–15% acetone/dichloromethane. Concentration in vacuo followed by crystallization from ether/hexane gave the title compound. M.S.(M+1): 371.

Provenance & Evidence