Ethanol → HCID 178485018, compound

A solution of cysteamine hydrochloride (5.68 g) in water (20 ml) was added to a suspension of N-cyano-N,S-dimethylisothiourea (6.46 g) in ethanol (100 ml). A solution of sodium hydroxide (4.0 g) in water (20 ml) was added to the mixture and the suspension was heated under reflux for one hour. The resulting clear solution was concentrated to remove ethanol, a little more water was added and the alkaline aqueous solution was extracted with ethyl acetate. The aqueous solution was adjusted to pH4 with hydrochloric acid and extracted with ethyl acetate. This latter organic extract was dried and evaporated to give N-cyano-N'-methyl-N"-(2-mercaptoethyl)guanidine (6.12 g) as a colourless oil. In order to characterise this product a solution of 2,4-dinitrochlorobenzene (7.7 g) in 95% ethanol (50 ml) was added to a solution of N-cyano-N'-methyl-N"-(2-mercaptoethyl)guanidine (6.0 g) in 95% ethanol. The mixture was refluxed for one hour and cooled. The resulting crystalline solid (7.73 g) was collected and was triturated with a large volume of ether and was recrystallised from acetonitrile to afford N-cyano-N'-methyl-N"-[S-(2,4-dinitrophenyl)-2-mercaptoethyl]guanidine, m.p. 210°-211° C.

1. temperaturethe suspension was heated
2. temperatureunder reflux for one hour
3. concentrationThe resulting clear solution was concentrated
4. customto remove ethanol
5. additiona little more water was added
6. extractionthe alkaline aqueous solution was extracted with ethyl acetate
7. extractionextracted with ethyl acetate
8. extractionThis latter organic extract
9. customwas dried
10. customevaporated

ORD record

ord-4aad1456056f477283ccd86eb813d262

Source dataset

uspto-grants-1979_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04171325