SULFUR-CONTAINING HETEROCYCLES:FAILE SYNTHESIS OF 4H-1,3-THIAZINES BY THE REACTION OF 3-N-ACYLAMINO KETONES WITH LAWESSON'S REAGENT

摘要

The treatment of 3-N-acylamino ketones with Lawesson's reagent [LR:2,4-bis(p-methoxphenyl)-1,3,2,4-dithiaphosphetane 2,4-disulfide] afforded the sulfur-containing heterocycles,4H-1,3-thiazines in moderate to good yields,along with the corresponding 3-N-thioacylamino ketones.