反应详情

A stirred solution of the product from Step 1 (1.80 g, 0.0125 mol) in ethylene glycol dimethyl ether (DME, 50 ml) was treated with diphenylcyanocarbonimidate (3.0 g, 0.0126 mol) and kept under nitrogen at ambient temperature (25° C.) for 96 hours. The precipitate was collected by filtration, washed with DME and dried to give 2.16 g of the titled product, mp 219°-220° C.

1. customkept under nitrogen at ambient temperature
2. custom(25° C.)
3. customfor 96 hours
4. filtrationThe precipitate was collected by filtration
5. washwashed with DME
6. customdried