What type of reaction is this? (Modified organic nucleoside synthesis) What type of reaction is shown in step F of this patent image?
I tried looking it up in SciFinder, but I didn't get any results, and I have not seen this before.

Thank you!
Edit 1: I'm also wondering if there is a specific name for this reaction, so that I can look it up.
Edit 2 Yes I'm sorry I forgot the reagents. The patent number is WO2014078463A1 (Bennett et al.) and I included a screenshot below of the relevant description.
My thoughts are along the lines of @Andrew and @Waylander. Step F doesn't tell us much, @orthocresol! I prefer a cyclization, 1 $\rightarrow$ 2a, followed by hydrolysis of ester 2a to alcohol 2b. Alternatively, N-O bond homolysis with light would probably involve a cage mechanism. .