G. Kollenz, P. Seidler
Mar 1, 1984
Citations
0
Influential Citations
5
Citations
Journal
Zeitschrift für Naturforschung B
Abstract
Attempts to oxidize the 1,5-benzothiazepin-2,4-3H,5H-dione (1) using NaNO2/Acetic acid lead to isolation of two ring contracted products, namely the 1,4-benzthiazin-derivatives 4 and 5. A reasonable reaction pathway concerning the formation of these compounds is discussed. A simple synthesis of 6-methyI-1,5-benzoxazepin-2,4-3H,5H-dione (13) is described, the transformation of which into the corresponding vic. trione fails, even using a great number of oxidizing procedures. In some cases so far unknown malonic acid derivatives 14, 15 and 16 can be obtained.