Condition-controlled selective synthesis of spiroisoquinolinones or spiroisoindolinones via CHA–initiated spiroannulation, ring opening and ring contraction

Presented herein is a condition-controlled selective synthesis of isoindole spiroisoquinolinone or isoindole spiroisoindolinone derivatives based on the cascade reactions of 3-phenylisoxazolone with diazo homophthalimide.