反应详情

温度

20 °C

5 cm3 of 4N hydrochloric acid in dioxane are added to a solution of 1.39 g of tert-butyl N-[(4RS)-4-(1-imidazolylmethyl)-4,5-dihydro-2-thiazolyl]carbamate in 5 cm3 of dioxane, followed by addition of methanol to dissolve the reaction medium. After stirring at a temperature in the region of 20° C. for 48 hours, the reaction medium is concentrated under reduced pressure (1 kPa) at a temperature in the region of 40° C. and washed with isopropyl ether, with ethyl acetate and then with methanol. The suspension obtained is filtered and the filtrate is evaporated as above and then chromatographed on a column of silica gel, eluting with a mixture of dichloromethane/methanol/28% aqueous ammonia (50/5/1 by volume). The fractions containing the expected product are combined and then concentrated under the above conditions to give 0.33 g of (4RS)-4-(1-imidazolylmethyl)-4,5-dihydro-2-thiazolyl-amine in the form of a viscous yellow oil [1H NMR spectrum (300 MHz, CD3)2SO-d6, δ in ppm): 2.93 (mt: 1H); 3.26 (mt: 1H); 4.03 (d, J=6 Hz: 2H); 4.39 (mt: 1H); 6.49 (unresolved complex: 2H); 6.87 (mt: 1H); 7.20 (mt: 1H); 7.63 (broad s: 1H)].

1. dissolutionto dissolve the reaction medium
2. concentrationthe reaction medium is concentrated under reduced pressure (1 kPa) at a temperature in the region of 40° C.
3. washwashed with isopropyl ether, with ethyl acetate
4. customThe suspension obtained
5. filtrationis filtered
6. customthe filtrate is evaporated as above and
7. customthen chromatographed on a column of silica gel
8. washeluting with a mixture of dichloromethane/methanol/28% aqueous ammonia (50/5/1 by volume)
9. additionThe fractions containing the expected product
10. concentrationconcentrated under the above conditions