Regio- and stereoselective 1,2 Wagner-Meerwein shifts during trifluoroacetic acid catalyzed isomerization of unsymmetrically substituted tricyclo[3.2.0.02,4]heptanes
Regio- and stereoselective 1,2 Wagner-Meerwein shifts during trifluoroacetic acid catalyzed isomerization of unsymmetrically substituted tricyclo[3.2.0.02,4]heptanes
作者:Rene Gree、Hokoon Park、Leo A. Paquette
DOI:10.1021/ja00533a018
日期:1980.6
Stereochemical Memory in the Regioselective and Diastereoselective Rearrangement of Tricyclo[3.3.0.0<sup>2,4</sup>]octanes (Housanes) by Electron Transfer (1,3-Cyclopentanediyl Radical Cations) and Acid (Cyclopentyl Carbenium Ions) and Silver-Ion Catalysis
作者:Waldemar Adam、Christian P. Librera、Frank-Gerrit Klärner、Frank Wurche
DOI:10.1021/ja028649m
日期:2003.1.1
silver(I)-ion-promoted rearrangements, whereas the rearrangement catalyzed by HClO(4) affords a complete reversal in the product selectivity and both the regioselectivity and the diastereoselectivity are much reduced. Migration to the phenyl terminus is favored to afford the 6' and 7' cyclopentenes, of which the former (CH(3) migration) dominates. For the minor regioisomer, only the cyclopentene 6 is formed by