Easy Synthesis of Functionalized Hetero[7]helicenes.
Hetero[7]helicenebisquinones can be synthesized easily on a multigram scale by combining the silyl enol ethers of 3,6-diacetyldibenzofuran, 3,6-diacetyldibenzothiophene, and 3,6-diacetylcarbazole with p-benzoquinone. They can be resolved into their enantiomers by a procedure that had previously been used to resolve carbohelicenebisquinones. Their absolute configurations are assigned.
Dreher
Spencer D.
SD
Department of Chemistry, Columbia University, New York, New York, 10027.
Weix
Daniel J.
DJ
Katz
Thomas J.
TJ