How is (4aR,10bR)-4-Propyl-3,4,4a,5,6,10b-hexahydro-2H-naphtho[1,2-b][1,4]oxazin-9-ol hydrochloride (CAS: 99705-65-4) typically synthesized?

The compound can be synthesized via a multi-step procedure, often involving the condensation of naphthalene derivatives followed by ring expansion and oxidation. The exact synthesis route may vary depending on the availability of starting materials and desired purity, but common methods include the use of reagents like acetic anhydride and sodium hydroxide under controlled conditions. The yield and selectivity of the reaction can be optimized by adjusting reaction parameters such as temperature and time.