Scheme 5.
Initial synthesis of C7 fluoride 27 via fluoro-Prins cyclization.a
aReagents and Conditions: a) BF3·OEt2, ether, −45 °C to rt, ~15%.
Initial synthesis of C7 fluoride 27 via fluoro-Prins cyclization.a
aReagents and Conditions: a) BF3·OEt2, ether, −45 °C to rt, ~15%.