Synthesis and Characterization of a Cyclobutane Duocarmycin Derivative Incorporating the 1,2,10,11-Tetrahydro-9<i>H</i>-cyclobuta[<i>c</i>]benzo[<i>e</i>]indol-4-one (CbBI) Alkylation Subunit
作者:James P. Lajiness、Dale L. Boger
DOI:10.1021/ja106986f
日期:2010.10.6
spirocyclization of a phenol onto a tethered alkylhalide to form the desired cyclobutane. The conditions required for the implementation of the Ar-4' spirocyclization indicate that the entropy of activation substantially impacts the rate of reaction relative to that for the much more facile Ar-3' spirocyclization, while the higher enthalpy of activation slows the reaction relative to an Ar-5' spirocyclization