Novel methoxyl and hydroxyl directed pinacol rearrangements of an isocaryolane sesquiterpenoid under Mitsunobu conditions
摘要:
Treatment of 8-methoxy-isocaryolan-9 alpha-ol (1) with acid on the one hand and with diethyl azodicarboxylate (DEAD)/triphenylphosphine on the other, leads to different pinacol rearrangements of the isocaryolane skeleton. 1S,2S,5R,9R-8-oxo-1,4,4-trimethyltricyclo[7.2.1.0(2,5)]dodecane (2), which possesses a novel sesquiterpenoid skeleton, was obtained under Mitsunobu conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.