Protect hydroxyl groups that may interfere with the selective acylation at C-8. Common protecting groups include benzyl ethers or silyl ethers. Protect other reactive functional groups as necessary.
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(2R-trans)-2-[3,4-bis(phenylmethoxy)phenyl]-3,4-dihydro-5,7-bis(phenylmethoxy)-2H-1-benzopyran-3-ol
Trifluoroacetic anhydride
diethyl (benzylamino)(spiro[2.2]pent-1-yl)methylphosphonate
1,2-O-isopropylidene-3-O-benzoyl-3-vinyl-α-D-erythrofuranose
