Inside-Outside Stereoisomerism. 6.+ Synthesis of trans-Bicyclo[4.4.1]undecan-11-one and the First Stereoselective Construction of the Tricyclic Nucleus of the Ring System of the Ingenane Diterpenes
作者:Jeffrey D. Winkler、Kevin E. Henegar、Bor-Cherng Hong、Paul G. Williard
DOI:10.1021/ja00089a006
日期:1994.5
The intramolecular dioxenone photocycloaddition reaction provides access to compounds which in many cases cannot be otherwise prepared. The application of this methodology to the construction of trans-bicyclo[4.4.1]undecan-11-one, 16, which is ca. 10 kcal/mol more strained than the corresponding cis-bridged isomer, is described. The extension of this preliminary result to the first synthesis of the tricyclic ingenane nucleus with the requisite ''inside-outside'' or trans intrabridgehead stereochemical relationship is reported.