反应详情

温度

-78 °C

LiHMDS solution (1 M, 27.7 mL) was added over 10 min to a suspension of N-(7-oxo-4,5,6,7-tetrahydro-benzothiazol-2-yl)-acetamide (Stage A.5, 2.0 g, 9.23 mmol) in dry THF (20 mL) cooled at −78° C. under an argon atm. The RM was then stirred at −78° C. for 2.5 h and methyl formate (2.308 mL, 36.9 mmol) added dropwise over 30 min. The RM was then warmed slowly to rt and was then stirred 18 h at rt. The RM was drown out into aqueous 1 M HCl (70 mL) and extracted 3× with DCM, dried over Na2SO4 and evaporated to give a the title compound as a solid. HPLC: tR 3.65 min (method D). MS: M−H=237. 1H-NMR in DMSO-d6 (400 MHz): 12.50 (s, br, 1H); 7.55 (s, 1H); 2.90-2.60 (m, 4H); 2.15 (s, 3H).

1. temperatureThe RM was then warmed slowly to rt
2. stirringwas then stirred 18 h at rt
3. extractionextracted 3× with DCM
4. dry with materialdried over Na2SO4
5. customevaporated