The syntheses of tetracyclic 1,5-benzoxazepines 3a-e from heterocyclic (3-chloroaldehydes 1a-e and 2-aminophenol are reported herein (Scheme I). Attempted lithium aluminium hydride (LiAlH4) reduction of the imine double bond in 3a-e failed to furnish the corresponding saturated compounds 5a-e. Attempted catalytic hydrogenation of 3a-e in the presence of acetic acid and acetic anhydride gave surprisingly
SYNTHESIS OF TETRAHYDRO AND HEXAHYDRO TETRACYCLIC 1,5-BENZOXAZEPINES
作者:Batchu Chandrasekhar、G. Om Reddy、M.R. Sarma、A.S.R. Prasad、Rabin Bera、T.S.V. Prasad Reddy
DOI:10.1515/hc.2002.8.2.141
日期:2002.1
system fused to different positions of the seven membered ring. Tetracyclic indolo-". benzofuro-'. pyrazolopyrido-. quino-\ benzopyrano-. benzothiopyrano-. quinazolinone-. quinoxylino-1.5-benzothiazepines are known. Surprisingly. little work has been reported in the literature on the preparation of tetracyclic-1.5-benzoxazepines. In a broad programme to synthesize such polycyclic heterocycles and in