Synthesis of 3’H-Spiro[cyclohexane-1,1’-isobenzofuran]-2,5-dien-4- one and Skeleton Construction of Type D Spirobisnaphthalene Structure via Dearomatization by Highvalance Iodine Reagent and Diels-Alder Reaction

The core skeleton syntheses of 3′ H -spiro[cyclohexane-1,1′-isobenzofuran]-2,5-dien-4-one 3 were explored. Then, two key skeleton molecules (5ah and 6d) were successfully constructed in 78% and 39% overall yields.