Abstract
| - Synthesis of (23E)-cycloart-23-ene-3β,25-diol (1) and its23Z-isomer 2 was achieved by using cycloartenol as a startingmaterial, thus revising the proposed structure of natural 2 to1 unequivocally. These synthetic studies revealed that thestructural revision (Z-form → E-form) should also be appliedto terpenoids such as (23Z)-3β-acetoxyeupha-7,23-diene-25-ol, (23Z)-tirucalla-7,23-diene-3β,25-diol, quadrangularol A,quadrangularic acid K, and daurichromene C.
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