Convenient synthesis of 6-substituted-2-chloro-5,12-dihydro-5-oxobenzoxazolo[3,2-a]quinolines and N-acylated-3-chlorodibenz[b,e][1,4]oxazepin-11(5H)-ones

Convenient synthesis of variously substituted 2‐chloro‐5,12‐dihydro‐5‐oxobenzoxazolo[3,2‐a]quinolines at the 6‐position and N‐acylated‐3‐chlorodibenz[b,e][1,4]oxazepin‐11(5H)‐ones are reported. The former compounds were obtained in 65–93% yield by simply heating N‐acyl‐4‐chloro‐N‐(2‐hydroxyphenyl)‐anthranilic acids in acetic anhydride for 4 hours, and the latter by heating sodium salt of N‐acyl‐4‐chloro‐N‐(2‐hydroxyphenyl)anthranilic acids with acetic anhydride.