Chloroform → N-(2-{[(4-Bromo-1,2-thiazol-3-yl)methyl]sulfanyl}ethyl)-N'-methylthiourea

The reaction of 4-bromo-3-(bromomethyl)isothiazole (8.5 g.) with cysteamine (from cysteamine hydrochloride (3.76 g.)) was performed under conditions similar to those described in Example 122. From the reaction there was obtained 4-bromo-3-[-(2-aminoethyl)thiomethyl]isothiazole hydrobromide, which, following recrystallisation from ethanol-ether and acetonitrile, gave needles (4.05 g.), m.p. 111°-112°. The amine base (2.73 g.) was isolated by basification with sodium hydroxide and extraction with chloroform and then dissolved in ethanol and treated with methyl isothiocyanate (0.78 g.). The solution was heated under reflux for 30 minutes, concentrated and the residue triturated with ether to yield the crystalline thiourea (2.9 g.) m.p. 60°-61°. Recrystallisation from isopropyl acetate gave N-methyl-N'-[2-((4-bromo-3-isothiazolyl)methylthio)ethyl]thiourea (2.3 g.) as needles, m.p. 62°-63°. (Found: C, 29.5; H, 3.8; N, 12.9; Br, 24.6; S, 29.3. C8H12BrN3S3 requires: C, 29.5; H, 3.7; N, 12.9; Br, 24.5; S, 29.5).

1. customrecrystallisation from ethanol-ether and acetonitrile
2. customgave needles (4.05 g.), m.p. 111°-112°
3. temperatureThe solution was heated
4. temperatureunder reflux for 30 minutes
5. concentrationconcentrated
6. customthe residue triturated with ether

ORD-Eintrag

ord-b24bc9ab48cf4f00924aa041faf4784f

Quelldatensatz

uspto-grants-1980_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04226874