Development of a Scalable Synthetic Route to (1 R ,5 R )-2,2-Dimethoxybicyclo[3.1.0]hexan-3-one: An Important Intermediate in the Synthesis of Lenacapavir

(1R,5R)-2,2-Dimethoxybicyclo[3.1.0]hexan-3-one is used in the asymmetric synthesis of lenacapavir. Herein, we report an enantioselective synthesis of this important chiral intermediate from the inexpensive commodity (R)-epichlorohydrin. This synthetic method comprises 6 steps, including a 4-step telescoped bicyclic ketone synthesis, I₂-promoted hydroxylation, and an Albright-Goldman oxidation. This sequence affords (1R,5R)-2,2-dimethoxybicyclo[3.1.0]hexan-3-one in an overall 25% isolated yield as an enantiomerically pure compound. The entire process has been successfully demonstrated on a hundred-gram scale.