Dual Behavior of Masked <i>o</i>-Benzoquinones in Intermolecular Diels−Alder Reactions with Acyclic Dienes: A Rapid Entry to Polyfunctionalized Bicyclo[2.2.2]oct-5-en-2-ones and <i>cis</i>-Decalins
作者:Chien-Hsing Chen、Rama Krishna Peddinti、N. S. Kameswara Rao、Chun-Chen Liao
DOI:10.1021/jo0494580
日期:2004.8.1
14a−f−17a−f with regio- and stereoselectivity, except in the case of MOB 8. The formation of cis-decalins in these Diels−Alderreactions illustrates the dienophilic character of MOBs, in addition to their general behavior as dienes. The ratio of the two cycloadducts obtained in each reaction as a result of the dual character of MOBs depends on the nature and/or position of the substituents on both the
Stereocontrolled Synthesis of Polyfunctionalized <i>cis</i>-Decalins from 2-Methoxyphenols: Total Syntheses of (±)-Eremopetasidione, (±)-3β-Angeloyloxyfuranoeremophilane, and (±)-3β-Methacryloyloxyfuranoeremophilane
A four-step stereocontrolled synthesis of polyfunctionalized cis-decalins is described, involving oxidation of 2-methoxyphenol, intermolecular Diels−Alder reaction, olefination, and Cope rearrangement. Application of this efficient strategy to the total syntheses of (±)-eremopetasidione, (±)-3β-angeloyloxyfuranoeremophilane, and (±)-3β-methacryloyloxyfuranoeremophilane was accomplished from creosol