Enantioselective Ullmann Ether Couplings: Syntheses of (—)-Myricatomentogenin (VIII), (—)-Jugcathanin (X), (+)-Galeon (III), and (+)-Pterocarine (IV).

The optimized Ullmann ether couplings by using N-methyl-L-proline as chiral catalyst render possible the enantioselective cyclization of compounds (I) and (V) to give the axial chiral cyclophane products which can be selectively deprotected to give the title species without loss of enantioselectivity.