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Note | Regular issue | Vol 63, No. 12, 2004, pp.2837-2843
Published online, 26th October, 2004
DOI: 10.3987/COM-04-10210
Two New Bicoumarins from the Leaves of Murraya exotica

Naoko Teshima, Mayumi Tsugawa, Akiko Tateishi, Mariko Tokumaru, Rie Matsubara, Tetsutaro Kimachi, Motoharu Ju-ichi,* Chihiro Ito, and Hiroshi Furukawa

*Faculty of Pharmaceutical Sciences, Mukogawa Women’s University, 11-68 Koushien Kyuban-Cho, Nishinomiya, Hyogo 663-8179, Japan

Abstract

Two new bicoumarins, named murradimerin A (1) and murramarin B (5) were isolated from the leaves of Murraya exotica (Rutaceae) collected in Ishigaki-island Japan. Their structures were elucidated on the basis of spectroscopic data especially using 2D NMR spectrum. Naturally occurring bicoumarin connected two coumarin moieties by orthoester structure as in murramarin (5) is unusual type and murramarin B (5) is the first example not possessing furanocoumarin moiety.