作者:Joseph S. Warmus、Mikhail A. Rodkin、Robert Barkley、A. I. Meyers
DOI:10.1039/c39930001357
日期:——
Metallation of 6,7-dimethoxy isoquinoline formamidines show a kinetic isotope effect, in contrast to the metallation of the 6,7-dihydro system; the isotope effect for the secondary proton in the dimethoxy system is smaller than usual (2.0) while the isotope effect for tertiary proton removal is somewhat larger (∼4.0), this is explained by the magnitude of pKa on isotope effect as well as competition between the pre-complexation step and the deprotonation step.
6,7-二甲氧基异喹啉甲脒的金属化表现出动力学同位素效应,这与6,7-二氢系统的金属化形成对比;二甲氧基系统中次级质子的同位素效应小于通常值(2.0),而三级质子去除的同位素效应则稍大(∼4.0),这可以用同位素效应的pKa值以及预络合步骤和脱质子步骤之间的竞争来解释。