The synthesis of the highly reactive five‐membered cyclic phosphorylating reagents 6a and 12 is described. The reagent 6a monophosphorylates alcohols without ring opening, whereas 12 diphosphorylates with ring opening yielding phosphate triesters.
The unsaturated ethers (III), prepared from the alcohols (I) and the vinyl ethers (II), are photolyzed to form the tricyclic ethers (IV), together with the ketones (V).
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