Synthesis of 7a-Substituted Hajos-Wiechert Ketone Analogues.

[摘要]：= Ph, 4-MeOC6H4, cyclohexyl, etc.) has been developed. This operationally simple, two-step procedure is amenable to multigram scale prepns. of these useful synthetic intermediates. These compds. I are then transformed to previously unknown, higher analogs II of the Hajos-Parrish-Eder-Sauer-Wiechert ketone via an enantioselective Robinson annulation.

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