反应详情

An ice cold 4 M solution of HCl in dioxane (4.73 mL, 18.9 mmol) was added to a solution of tert-butyl 4-carbamoyl-1,1-dioxo-1,3-thiazolidine-3-carboxylate (Example 127 c, 500 mg, 1.89 mmol) in dichloromethane (10.2 mL). The mixture was stirred for 4 d at ambient temperature. Removal of the solvent in vacuo yielded the title compound (388 mg, quant.) as white solid which was used in the next step without further purification, MS (ESI) m/e=198.99 [M−H−].

1. customRemoval of the solvent in vacuo