1-(3-Fluorophenyl)-3-oxabicyclo(3.1.0)hexan-2-one, (1S,5R)

It acts as a structural building block to construct the specific cyclopropane core of the API, typically produced through reduction and subsequent functionalization to form the final active ingredient, often starting from 1(S)-(3-fluorophenyl)-2(R)-(hydroxymethyl)cyclopropanecarbonitrile. (1S,5R)-1-(3-Fluorophenyl)-3-oxabicyclohexan-2-one is a key chiral intermediate employed to synthesize lemborexant, an orexin receptor antagonist.

API Name Lemborexant
CAS No 528587-70-4
Molecular Formula C11H9FO2
Molecular Weight 192.19 g/mol
Synonyms (1S,5R)-1-(3-fluorophenyl)-3-oxabicyclo[3.1.0]hexan-2-one

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