New method for the synthesis of the 1,3-thiazine system. 2-phenylamino-5,6-dihydro-4H-1,3-thiazin-5-ones
Treatment of N-phenylthioureidoalkyl-α-diazo ketones with acids leads to 2-phenyl-amino-5,6-dihydro-4H-1,3-thiazin-5-ones.