Preparation of reissert compounds derived from the thieno[3,2-c]pyridine,thieno[2,3-d]pyridazine and the thieno[2,3-d]pyrimidine ring systems

The use of tributyltin cyanide, trimethylsilyl cyanide and potassium cyanide in the Reissert reaction is contrasted in the furo3,2-c]pyridine, thieno3,2-c]pyridine, thieno2,3-dpyridazine, and thieno2,3-d]pyrimidine ring systems.