XVIII, x= s xv, x= o XVII, x= s method of Koiiig, et aL2 The procedure involved a bromine cyclization of l-thiocarbamyl-1, 2, 3, 4-tetra-hydroquinoline and the product was isolated as the hydrobromide salt. The base was obtained as a lowmelting solid by treatment of the salt with aqueous sodium hydroxide solution. The 2-oxo analog (XI) was prepared by a modification of Konig's method. 2 In this procedure, the 2-imino compound (X) was ...
![5,6-dihydro-4H-oxazolo[5,4,3-ij]quinoline-2-thione Structure](https://image.chemsrc.com/caspic/407/72696-21-0.png)
