反应详情

2-Amino-5,5,7,7-tetramethyl-4,5,6,7-tetrahydrobenzothiazole (16 grams; 0.075 mol) dissolved in pyridine (100 ml) was charged into a glass reaction vessel equipped with a mechanical stirrer and addition funnel. Ethyl chloroformate (11 grams; 0.1 mol) was then added dropwise with stirring and cooling of the reaction mixture. After the addition was completed the reaction mixture was allowed to warm to room temperature and stirring was continued for a period of about 1 hour. After this time the reaction mixture was poured into ice water resulting in a white precipitate. The precipitate was recovered by filtration, was dried and recrystallized from methanol to yield the desired product ethyl N-(5,5,7,7-tetramethyl-4,5,6,7-tetrahydrobenzothiazol-2-yl) carbamate having a melt point of 124° to 125° C.

1. additionwas charged into a glass reaction vessel
2. customequipped with a mechanical stirrer and addition funnel
3. temperaturecooling of the reaction mixture
4. additionAfter the addition
5. stirringstirring
6. filtrationThe precipitate was recovered by filtration
7. customwas dried
8. customrecrystallized from methanol