The synthesis proceeded from the readily available Diels-Alder adducts 2a3 and 2b. 4 In what appears to be a general sequence, monoreduction of these enediones with sodium borohydride afforded the corresponding a-hydroxycyclohexenones 3a and 3b, which photocyclized (benzene, uranium glass filter) in good yield to give the ketols 4a and 4b. These compounds were oximated (syn/anti mixtures), and the synthesis was completed by ...
![10-exo-hydroxytetracyclo[5.3.0.0.2,604,9]decan-3-one结构式](https://image.chemsrc.com/caspic/167/74069-58-2.png)