Maybee you could use the Blanc Reaction to make your Benzodioxazole benzyl Chloride.
Blanc Reaction
Benzene + CH2O + HCl -->> Benzyl Chloride
ZnCl2
Org React 1, 63 (1942)
and the product could be treated with cyanide, then condensed with EtOAc and decarboxylated as per the Russians.
Would you bee so kind as to transcribe these procedures or post links ect?