Rearrangements of Linear Triquinanes to the Angular Isomers
作者:James M. MacDougall、Harold W. Moore
DOI:10.1021/jo9907686
日期:1999.10.1
Warming substituted linear triquinanes in t-BuOK/t-BuOH resulted in their isomerization to the corresponding angularly fused isomers in good yield (59-84%). An alternate route employs a base-catalyzed intramolecular Michael addition of bicyclo[6.3.0]undecenediones, a class of compounds found to be readily-available from 1-alkenylbicyclo[3.2.0]hepten-7-ones via a "one-pot" sequence of reactions. This method is complementary to the isomerization reaction since it provides access to angular triquinanes not readily available from their linear isomers.
Oxy-Cope Rearrangements of Bicyclo[3.2.0]heptenones. Synthesis of Bicyclo[4.2.1]non-1(4)-en-6-ones and Bicyclo[5.2.1]dec-1(10)-en-5-ones
作者:Sharad K. Verma、Que H. Nguyen、James M. MacDougall、Everly B. Fleischer、Harold W. Moore
DOI:10.1021/jo991765w
日期:2000.6.1
1]non-1(4)-en-6-ones and the latter to the first examples of bicyclo[5.2.1]dec-1(10)-en-5-ones, compounds having exceptionally strainedbridgeheaddoublebonds. The transformations are controlled by the 6-exo-methyl group in the starting material along with the substituent at position-1 (bridgehead) which force attack of the lithium reagent from the concave face of the starting material, thus allowing the cyclopentenyl