This manuscript is dedicated to the late Professor Shô Ito, Professor Emeritus of Tohoku University, Japan, who showed Hiroshi Nishino the way as a chemist.
Key words
spiro[cycloalkane-1,3′-indoline]-2,2′-diones - oxidative cyclization - 5-
exo cyclization - radicals - heterocycles - spiro compounds - indolinones