Suggested Reaction 1.14.11.-

Left

(1R,4S)-1,3,3-Trimethyl-2-oxabicyclo[2.2.2]octan-6-one
+O2
+2-Ketoglutaric acid

Right

1,6,6-Trimethyl-2,7-dioxabicyclo[3.2.2]nonan-3-one
+CO2
+Butanedionic acid
[BiSSCat | GREP ]