No abstract

A new alkaloid, cycloshermilamine D, was isolated from the marine tunicate Cystodytes violatinctus, and its structure (1), which is closely related to shermilamine D, was established mainly on the basis of NMR spectroscopic data.

Haliclorensin (1), a novel diamino alkaloid possessing an azacyclodecane ring, has been isolated from the sponge Haliclona tulearensis. Its structure was elucidated on the basis of spectroscopic data, as well as by comparison with gamma-amino azacycloalkanes.

Four new tetraprenyltoluquinols (2−5) have been isolated from the Indo-Pacific soft corals Sinularia dura and Nephthea sp. Sindurol (2), isolated from the Sinularia, is a 1,3,5-trialkylated 2,8-dioxabicyclo[3.2.1]octane, and nephthoside (4), obtained from the Nephthea, is a new substituted hydroquinone d-arabinose glycoside. Compounds 3 and 5 are closely related to nephthoside (4). The structure determination of all new compounds was based mainly on 1D- and 2D-NMR spectroscopy and mass spectrometry, as well as some chemical transformations.