Cyanamide → HCID 18707474, compound

To a stirred solution of potassium tert-butoxide (0.46 g, 4.08 mmol) in tert-butanol (25 ml) was added cyanamide (0.32 g, 7.65 mmol) and the resulting mixture was stirred for 15 min. at room temperature. To this mixture was added 2-methanesulfinyl-5-naphthalen-2-yl-[1,3,4]thiadiazole (0.7 g, 2.55 mmol) and the mixture was heated at reflux temperature for 15 min. followed by addition of an additional portion of cyanamide (0.2 g, 4.76 mmol). Heating was continued for an additional 2 h. The cooled reaction mixture was quenched by addition of 1 N sodium hydroxide (150 ml) and diluted by addition of diethyl ether. The organic phases were separated and the aqueous phase was acidified to pH=1 with concentrated hydrochloric acid. The precipitate was filtered off, washed with water (2×10 ml) and diethyl ether (2×10 ml) and dried at 50° C. which afforded 0.25 g (39%) of the title compound as a solid.

1. temperaturethe mixture was heated
2. temperatureat reflux temperature for 15 min.
3. temperatureHeating
4. waitwas continued for an additional 2 h
5. customThe cooled reaction mixture
6. customwas quenched by addition of 1 N sodium hydroxide (150 ml)
7. additiondiluted by addition of diethyl ether
8. customThe organic phases were separated
9. filtrationThe precipitate was filtered off
10. washwashed with water (2×10 ml) and diethyl ether (2×10 ml)
11. customdried at 50° C. which

ORD record

ord-175ebd33355e42ddb861aff434745de2

Source dataset

uspto-grants-1999_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05972978