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US 5,969,149 AGranted
Process for producing hexahydrothieno[3,4-D]imidazole-2,4-diones
AssigneeSumitomo Chemical Company, Limited
InventorsNobuhiro Tani, Shinzo Seko
Life of this patent
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Abstract
There is disclosed a process for producing hexahydrothieno[3,4-d]imidazole-2,4-diones of the formula (1): wherein R is the same or different and represents a lower alkyl group, an alkenyl group, an aryl group or an aralkyl group all of which may be substituted, which is characterized by the step of reacting hexahydrofuro[3,4-d]imidazole-2,4-diones of the formula (2): ##STR1## wherein R has the same meaning as described above with hydrogen sulfide in the presence of a basic compound and sulfur.
Claims8
A process for producing hexahydrothieno[3,4-d]imidazole-2,4-diones of the formula (1):
- ##STR5## wherein R is the same or different and represents a lower alkyl group, an alkenyl group, an aryl group or an aralkyl group all of which may be substituted, which comprises:
- reacting hexahydrofuro[3,4-d]imidazole-2,4-diones of the formula (2):
- ##STR6## wherein R is the same meaning as defined above with hydrogen sulfide in the presence of a basic compound and sulfur.
Dependencies are inferred from the claim text.