Abstract

Reaction of the indole ether 3 with phenyl (trichloromethyl) mercury gives the syn-metacyclophane 5, exclusive of the anti-enantiomer 6. These ethers are new and their structures were established by their independent synthesis from the corresponding alcohols 7 and 8. These data are consistent with the conclusion that the intermediate cyclopropane 4 is formed by stereosperific addition of dichlorocarbene trans to the ethoxy group. Additional results are described providing evidence for the resistance of the benzylic carbon atoms in these highly constrained metacyclophanes to undergo change of hybridization from sp 3 to sp 2.

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