ISSN:
0941-1216
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Nitrosation of 2-Aryl-3,5-dimethyl-1,1-dioxo-1,2-thiazines - an Unusual Ringtransformation to Mesoionic Pyridazinium SaltsThe thiazines 1b-e, g, h react with isoamyl nitrite/HClg by nitrosation of the 3-methyl group to the 3-cyano-thiazines 3b-e, g, h. As by-products the mesoionic pyridazinium salts 4b, c are formed. The compounds 4b-i and 4-1e-i became main products by the nitrosation of 1b-i with sodium nitrite/HCl. In this case as by-products the oximes 2b-d were isolated, which can be transferred with sodium nitrite into 4b-d. The regioselectivity of the nitrosation reaction of 1 is influenced by the substituents of the aryl group.
Additional Material:
3 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19953370124
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