反应详情

To a solution of the product from Step 2, (R)-tetrahydro-furan-2-carboxylic acid (5-amino-[1,2,4]thiadiazol-3-ylmethyl)-methyl-amide (3.0 g, 12.4 mmol), and pyridine (1.08 g, 13.6 mmol) in DCM (120 mL) was added phenyl chloroformate (1.95 g, 12.4 mmol) by syringe at 0 C under N2. The reaction mixture was stirred at room temperature overnight, concentrated and purified by silica gel column chromatography (PE:EA=1:1) to afford Intermediate 39: (3-{[methyl-((R)-tetrahydro-furan-2-carbonyl)-amino]-methyl}-[1,2,4]thiadiazol-5-yl)-carbamic acid phenyl ester (3.0 g, yield: 67%) as a pale solid. LC-MS (m/z): 363.1 [M+H]+.

1. concentrationconcentrated
2. custompurified by silica gel column chromatography (PE:EA=1:1)