Process for the preparation of 6-methyl-3,4-dihydro-1,2,3-oxathi

Details Process for the preparation of 6-methyl-3,4-dihydro-1,2,3-oxathi Process for the preparation of 6-methyl-3,4-dihydro-1,2,3-oxathi

1988-08-02

1989-10-24

Ford, John M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D29106

Patent

active

048763411

ABSTRACT:
Acetoacetamide-N-sulfonic acid and its salts are cyclized with at least approximately the equimolar amount of SO.sub.3 in short times, preferably in special apparatus, to give 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide. In the case where more than the equimolar amount of SO.sub.3 is used, the latter compound is produced as an SO.sub.3 adduct which then needs to be hydrolyzed; the hydrolysis also takes place in short times and, particularly advantageously, in apparatus of the same type as for the cyclization.
The non-toxic salts, especially the potassium salt - of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2-dioxide are valuable synthetic sweeteners.

REFERENCES:
patent: 4563521 (1986-01-01), Clauss et al.
patent: 4607100 (1986-08-01), Clauss et al.
patent: 4638063 (1987-01-01), Clauss et al.
Clauss et al., Angewandte Chemie, vol. 12, No. 11, International Edition, pp. 869-876 (1973).
Petersen, Ber., vol. 83, pp. 551-558 (1950).

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