Formation and structure elucidation of two novel spiro[2H-indol]-3(1H)-ones.

Abstract

The molecular structures of two byproducts 1,1''-diphenyl-3',4'-dihydrodispiro[indole-2,2'-furan-5',2''-indole]-3,3''(1H, 1''H)-dione (3) and 1,5'-diphenyl-4',5'-dihydro-3'H-spiro[indole-2,2'-pyrano[3,2-b]indol]-3(1H)-one (4), which accompanied the rearrangement of 3-hydroxy-3-methyl-1-phenylquinoline-2,4(1H,3H)-dione (1) to 2-hydroxy-2-methyl-1-phenyl-1,2… (More)