Catalytic process for the preparation of thiazole derivatives

Details Catalytic process for the preparation of thiazole derivatives Catalytic process for the preparation of thiazole derivatives

2007-06-12

2007-06-12

Solola, Taofiq (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

10362500

ABSTRACT:
A process for the preparation of a compound of formula (I)wherein Q is CH or N; Y is NO2or CN; Z is CHR3, O, NR3or S; R1and R2are C1-C8alkyl or together form an alkylene bridge having two or three carbon atoms; by reacting a compound of formula H2C=C(X)CH2NCS wherein X is a leaving group, with a chlorinating agent in the presence of a catalytic amount of SO2. to form a compound of formula (III)and the compound of formula (III) is reacted with a compound of formula R1NHC(=QY)ZR2wherein R1, R2, Y, Z and Q are as defined for compound (I).

REFERENCES:
patent: 0260560 (1988-03-01), None
patent: 0446913 (1991-09-01), None
patent: 9832747 (1998-07-01), None

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