反应详情

A suspension of 0.92 g of (2R)-2-amino-3-(3-nitrophenyl)-1-propanol hydrochloride and 0.6 cm3 of tert-butyl isothiocyanate in 10 cm3 of ethanol is cooled to a temperature in the region of 0° C. and 0.56 cm3 of triethylamine is then added. The mixture is stirred for 18 hours at room temperature and is then heated at a temperature in the region of 60° C. for 2 hours; the suspension thus dissolves. 0.6 cm3 of tert-butyl isothiocyanate is added and heating is continued for 3 hours, after which the reaction medium is concentrated under reduced pressure (2 kPa) at a temperature in the region of 50° C. The yellow oil obtained is dissolved in 50 cm3 of ethyl acetate, after which the organic solution is washed with twice 50 cm3 of sodium chloride solution, dried over sodium sulfate, filtered and concentrated under reduced pressure (2 kPa) at a temperature in the region of 40° C. 1.2 g of N-(tert-butyl)-N′-[(1R)-2-hydroxy-1-(3-nitrobenzyl)-ethyl]thiourea are obtained in the form of a yellow oil. 1H NMR spectrum (300 MHz, (CD3)2SO-d6 with addition of a few drops of CD3COOD-d4, δ in ppm): 1.39 (s: 9H); 2.98 (limiting AB: 2H); 3.38 (limiting AB: 2H); 4.48 (mt: 1H); 7.60 (t, J=8 Hz: 1H); 7.74 (broad d, J=8 Hz: 1H); 8.09 (broad d, J=8 Hz: 1H); 8.16 (broad s: 1H).

1. additionis then added
2. temperatureis then heated at a temperature in the region of 60° C. for 2 hours
3. dissolutionthe suspension thus dissolves
4. temperatureheating
5. waitis continued for 3 hours
6. concentrationafter which the reaction medium is concentrated under reduced pressure (2 kPa) at a temperature in the region of 50° C
7. customThe yellow oil obtained
8. washafter which the organic solution is washed with twice 50 cm3 of sodium chloride solution
9. dry with materialdried over sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated under reduced pressure (2 kPa) at a temperature in the region of 40° C