Abstract
The stereoselective synthesis of 7-oxanorbornane regarding as a key synthetic intermediate of tetrodotoxin (TTX) is reported. The bicyclo ring bearing various functional groups was successfully elaborated by a furan Diels–Alder (DA) reaction. The stereoselective installation of a quaternary amino carbon center to the DA product was achieved with the Tsuji–Trost allylation. The stereochemistry was unambiguously confirmed with X-ray.
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