Oxidative photocyclization furnished the 6-carbomethoxy-7H-pyrido [4, 3-c] carbazoles 18 and 24. Reduction with lithium aluminum hydride gave the carbinols 19 and 23, which when treated with methyl isocyanate gave the corresponding N-methylcarbamates 20 and 26, which are potential antitumor agents. Manganese dioxide oxidation of 19 and 25 furnished the aldehydes 21 and 27. Treatment with methylenetriphenylphosphorane gave olefins 22 ...