Hideyo Suzuki

Antitumour triterpenes of Maytenus diversifolia

Abstract The known compounds maytansine and sitosterol-β- D -glucoside as well as the new triterpenes maytenfoliol and maytenfolic acid were isolated as antileukemic agents from Maytenus diversifolia . Other triterpenes isolated included the new maytensifolin-A and -B as well as the known friedelin, canophyllal, β-amyrin, canophyllol, pachysonol, 29-hydroxyfriedelan-3-one and 30-hydroxyfriedelan-3-one.

(+)-Arctigenin, a lignan from Wikstroemia indica

Abstract A new lignan, (+)-aretigenin has been isolated from the roots of Wikstroemia indica (Nan-Ling-Jao-Hua) and identified as 8(R) 8′(S)-4′-hydroxy-3, 4,3′-trimethoxylignan-olid (9, 9′) on the basis of spectral evidence as well as a direct comparison with its enantiomer, (−)-arctigenin.

Structure and stereochemistry of maytenfolic acid and maytenfoliol, two new antileukemic triterpenes from Maytenus diversifolia: X-ray crystal structures

The structure and stereochemistry of maytenfolic acid and maytenfoliol, two new antileukemic triterpenes isolated from Maytenus diversifolia, have been established from chemical Transformations and spectral and single-crystal X-ray analysis.

Structure and stereochemistry of radermasinin, a novel cytotoxic triterpene lactone from Radermachia sinica. X-Ray crystal structure of radermasinin monohydrate

The structure and stereochemistry of radermasinin, a novel cytotoxic triterpene lactone isolated from Radermachia sinica, have been established from spectral data and single-crystal X-ray analysis of its monohydrate.