Process for preparing substituted...

Details Process for preparing substituted... Process for preparing substituted...

2011-04-12

2011-04-12

Solola, Taofiq A (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07923571

ABSTRACT:
The present invention relates to a process for preparing4-alkoxycarbonyl-3-aminothiophenes of the general formula (I)and/or their hydrochlorides of the formula (I)′in which R1and R2are each as defined in the description, and/or their mono- or bisacetylated or mono- or bisformylated form,by reacting enamines of the formula (II)in which R1and R2are each as defined in the description, and/or their mono- or bisacetylated or mono- or bisformylated form,with a chlorinating agent in the presence of one or more diluents, and also to a process for preparing the compounds of the formula (II).

REFERENCES:
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P.N. Confalone, et al., “A total Synthesis of Biotin Based on Derivaties of 2,5-Dihydrothiophene1a”, J. Org. Chem., vol. 42, No. 9, 1997, pp. 1630-1633.
D.L. Schmidt, et al., “Reactions of the Chlorine Complex of Tetrahydrothiophene”, J. Org. Chem., vol. 50, 1985, pp. 2840-2847.
P.G. Gassman, et al., “Use of Halogen-Sulfide Complexes in the Synthesis of Indoles, Oxindoles, and Alkylated Aromatic Amines”, Journal of American Chemical Society, 95:19, Sep. 19, 1973, pp. 6508-6509.

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