反应详情

To a suspension of 5-tert-butyl-[1,3,4]oxadiazol-2-ylamine (Atlantic, 141 mg, 1.00 mmol) and Et3N (279 μL, 2.00 mmol) in MeCN (2 mL), 2,2,2-trichloroethyl chloroformate (207 μL, 1.50 mmol) was added in 4 portions over 1 min at RT (CARE: exotherm to ˜40° C.). The resulting suspension was stirred for 1 h. The suspension was filtered, washing the solid with MeCN (3 mL), and concentrated to leave a yellow-brown paste. Purification by FCC, using 0-2.5% MeOH in DCM, gave a buff foam (232 mg, 73%). 1H NMR (400 MHz, CDCl3): 1.42 (9H, s), 4.86 (2H, s).

1. additionwas added in 4 portions over 1 min at RT (CARE: exotherm to ˜40° C.)
2. filtrationThe suspension was filtered
3. washwashing the solid with MeCN (3 mL)
4. concentrationconcentrated
5. customto leave a yellow-brown paste
6. customPurification by FCC