Stereoselective Synthesis of a Model C(18)-C(35) Spiroketal Fragment of Integramycin

[摘要]：A highly stereoselective synthesis of a model C(18)-C(35) spiroketal unit (7) of integramycin has been accomplished via an enantioselective stannyl-crotylboration reaction and an N-iodosuccinimide-mediated spiroketalization of 19a.

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