A convenient approach for the synthesis of β-cyanoepoxides is illustrated by iodine(III)-catalyzed
epoxidation of electron-deficient β-cyanostyrenes, wherein the active catalytic iodine(III)
species was generated in situ. The epoxidation of β-cyanostyrenes was performed using
10 mol% PhI as precatalyst in the presence of 2.0 equivalents Oxone as an oxidant
and 2.4 equivalents of TFA as an additive at room temperature under ultrasonic radiations.
The β-cyanoepoxides were isolated in good to excellent yields in a short reaction
time.
Key words
epoxidation reaction - β-cyanostyrene - β-cyanoepoxide - iodobenzene - trifluoroacetic
acid - Oxone