Tsunao Hase

Triterpenes from Ilex rotunda fruits

Abstract Two new triterpenes have been isolated from the fruits of Ilex rotunda along with three known triterpenoids ulsolic acid, rotundic acid and peduncloside. Their structures were characterized as 3β,19α,24-trihydroxyurs-12-ene-28-oic acid and 3β,19α-dihydroxyurs-12-ene-23,28-dioic acid by spectral and chemical means.

Structure of a limonoid antifeedant from Trichilia roka

Abstract A new limonoid, 7-acetyltrichilin A, has been isolated from the root bark of Trichilia roka and identified as an antifeedant against North American and Japanese pest insects.

Denticulatolide, an ichthyotoxic peroxide-containing cembranolide from the soft coral Lobophytum denticulatum

Abstract Denticulatolide, an ichthyotoxic cembranoid diterpene bearing acetoxy, α-methylene γ-lactone, and cyclic peroxide functions, has been isolated from the soft coral Lobophytum denticulatum. The structure (1) has been determined by spectral and chemical evidence and X-ray crystallographic method.

A bitter monoterpene diglycoside from viburnum urceolatum

Abstract From the methanolic extract of the leaves of Viburnum urceolatum a new bitter monoterpene diglycoside, urceolide, has been isolated in addition to several known compounds. The structures were elucidated by spectroscopic and chemical methods.

A new eunicellin-based diterpene from an okinawan soft coral, Cladiella sp.

Abstract A new eunicellin-based diterpene has been isolated from a Cladiella sp. (Octocorallia, Alcyonacea). The structure and relative stereochemistry of the metabolite (1) was determined on the basis of spectroscopic and chemical evidence, and confirmed by a single-crystal X-ray structure determination.

Iridoid glucosides from Viburnum suspensum

Abstract Two new non-bitter iridoid glucosides have been isolated from Viburnum suspensum , and their structures elucidated by spectroscopic methods.

Azedarachol, a steroid ester antifeedant from Melia azedarach var. japonica

Abstract A new steroid ester, azedarachol, from the root bark of Melia azedarach has been identified as an antifeedant against a Japanese insect pest and the structure has been assigned as 2α,3α,16β-trihydroxy-5α-pregnane 20 R -methacrylate.

Three iridoid glycosides from Viburnum furcatum

Abstract Three new bitter iridoid glycosides having an 8,10,11-oxygen substituted iridoid skeleton with an isovaleryl moiety at C-1, have been isolated from the ether and ethyl acetate soluble fractions of the leaves of Viburnum furcatum . Two of them had a glucose moiety at C-11 of the iridoid skeleton and a p -coumaroyl group linked to C-6 of the sugar, and they were found to be geometrical isomers about the double bond of the p -coumaroyl† moiety. The third one was characterized as a alloside of the same aglycone.

A bitter monoterpene glucoside from Viburnum phlebotrichum

Abstract From the methanol extract of the leaves of Viburnum phlebotrichum, a new bitter monoterpene glucoside has been isolated in addition to three known

Raphanusol A, a new growth inhibitor from sakurajima radish seedlings

Abstract A new growth inhibitor, raphanusol A, isolated from an acetone extract of light-exposed seedlings of Sakurajima radish, was characterized as 1-,β,4-di- O -(4-hydroxy-3,5-dimethoxycinnamoyl) gentiobiose by chemical methods and spectral data.