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■ Three New 5,6-Dihydro-α-pyrones Isolated from Cryptocarya nitens

Koki Mori, Aiko Shimogomi, Naohito Abe, Manami Haba, Tomoaki Yoshimura, Joko Ridho Witono, Dedy Darnaedi, Toshiyuki Tanaka, Jin Murata, and Masayoshi Oyama*

*Laboratory of Pharmacognosy, Gifu Pharmaceutical University, 1-25-4 Daigaku-Nishi, Gifu 501-1196, Japan

Abstract

Three new 5,6-dihydro-α-pyrone derivatives, named cryptonitenones A–C (1–3), were isolated from the leaves of Cryptocarya nitens Koord. & Valeton. Their absolute structures were determined by means of the NMR and CD spectroscopic analyses. In addition, their deacetyl precursor, cryptomoscatone E3, was obtained from the twigs of the plant.