Method for producing 3,...

Details Method for producing 3,... Method for producing 3,...

2005-02-16

2008-08-05

Habte, Kahsay T (Department: 1624)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C562S040000

Reexamination Certificate

active

07408059

ABSTRACT:
A method produces a 3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide compound of following formula (2):wherein R1and R2are the same as or different from each other and are each hydrogen atom or an organic group inert to the reaction; and R3is hydrogen atom or an organic group inert to the reaction, or a salt thereof, by subjecting a beta-ketoamide-N-sulfonic acid of following Formula (1):wherein R1, R2and R3are as defined above; and X is hydrogen atom, or a salt thereof, to cyclization in the presence of an acid anhydride with or without further subjecting the cyclized product to hydrolysis, in which the cyclization is continuously carried out using a continuous flow reactor.

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