Application
Ethoxycarbonyl isothiocyanate reacts with 2-amino-tetrahydrobenzo[b]thiophene derivatives to yield tetrahydrobenzo[b]thiophen-2-thiourea derivatives.
Ethoxycarbonyl isothiocyanate has been used in the synthesis of:
pyrazolo[1,5-a][1,3,5]triazine derivatives, potential inhibitors of protein kinase CK2
fused thiophene derivatives, having antibacterial and antifungal activities
4-thiouracil derivatives
thiocarbamides from stannylarenes
1,3,5-triazin-2-one-4-thiones from 2-amino-2-oxazolines
N-acylthioureas from aminodeoxy sugars
Synthesis
Example 1: Preparation of ethoxycarbonyl isothiocyanate
To a 1 liter jacketed reactor was added sodium thiocyanate (39.1 g, 0.48 mol) and 310 g of toluene. After heating the mixture to 30°C, pyridine (0.4 g, 0.005 mol) and water (0.9 g, 0.05 mol) were added sequentially. Subsequently, ethyl chloroformate (52.9 g, 0.49 mol) was added slowly and dropwise to the reaction system over 40 minutes. The reaction solution was maintained under stirring for 3 hours, during which time the progress of the reaction was monitored by gas chromatography (GC) to confirm that the ethyl chloroformate was almost completely consumed. Upon completion of the reaction, the reaction solution was filtered and analyzed by gas chromatography combined with quantitative internal standard method and the yield of ethoxycarbonyl isothiocyanate was measured to be 99%.
References
[1] Patent: US2014/100381, 2014, A1. Location in patent: Page/Page column
[2] Journal of Organic Chemistry, 1990, vol. 55, # 18, p. 5230 - 5231
[3] Research on Chemical Intermediates, 2012, vol. 38, # 3-5, p. 903 - 909
[4] Patent: US2014/100381, 2014, A1. Location in patent: Page/Page column
[5] Journal of Organic Chemistry, 1990, vol. 55, # 18, p. 5230 - 5231
