Process for producing hexahydrothieno[3,4-D]imidazole-2,4-diones

Details Process for producing hexahydrothieno[3,4-D]imidazole-2,4-diones Process for producing hexahydrothieno[3,4-D]imidazole-2,4-diones

1998-09-28

1999-10-19

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483031, C07D23526

Patent

active

059691492

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.

REFERENCES:
Conversion of Anhydride to Thiolactone in Biotin Synthesis- Katsura Kogure et al. (Agr. Biol. Chem. 40(8) 1657-1658, 1976).
Versuche zur Biotinsynthese, Preparation of (3aS, 6aR)-1,3-dibenzyltetrahydro-4H-thieno [3,4-d ]imidazole-2, 4(1H)-dione. Gerecke, M. et al.Helv. Chim. Acta (1970), 53(5), 991-9, Basel/Switzerland .

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