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

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

C - Chemistry, Metallurgy

07

C

260/243, 260/502

C07C 307/02 (2006.01) C07D 291/06 (2006.01)

Patent

CA 1273923

Abstract of the disclosure: 6-Methyl-3,4-dihydro-1,2,3-oxathiazin-4-one 2,2- dioxide is prepared by a) reacting, in an inert organic solvent, a salt of sulfamic acid, which is at least partially soluble therein, with at least approximately the equimolar amount of an acetoacetylating agent, in the presence of an amine or phosphine catalyst, and by cyclizing the acetoacetamide-N-sulfonate which is formed in this reaction, or the free sulfonic acid, b) by the action of at least approximately the equimolar amount of S03, where appropriate in an inert inor- ganic or organic solvent, to give 6-methyl-3,4-dihydro- 1,2,3-oxathiazin-4-one 2,2-dioxide, which is produced in the form of the acid in this reaction; it is possible, if desired, to obtain from the acid form c) the appropriate salts by neutralization with bases. The non-toxic salts - in particular the potassium salt - are valuable synthetic sweeteners.

477148

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