The chiral formylmethyl(vinyl)tetrahydro-pyranone (16), a potential versatile synthon for the chiral synthesis of the Corynanthe-type indole alkaloids, has been synthesised and converted into (–)-antirhine, the major alkaloid of Antirhea putaminosa(F. Muell.) Bail.
S. Takano, N. Tamura and K. Ogasawara, J. Chem. Soc., Chem. Commun., 1981, 1155 DOI: 10.1039/C39810001155
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