Experimental and Computational Studies Unraveling the Peculiarity of Enolizable Oxoesters in the Organocatalyzed Mannich-Type Addition to Cyclic N-Acyl Iminium Ions
作者:Andrea Menichetti、Sebastiano Di Pietro、Valeria Di Bussolo、Lucilla Favero、Mauro Pineschi
DOI:10.3390/molecules25081903
日期:——
some organocatalyzed reactions proceeding with a high enantioselectivity. In our experimentation we found that the use of these compounds as the enolizable (nucleophilic) component in organocatalyzed Mannich-type reactions using in situ-generated cyclic N-acyl iminium ions gave low diastereoselectivity and low to moderate values of enantioselectivity. This significant drop of facial selectivity with respect
γ- 和 δ-氧代酯是容易获得的起始材料,在一些以高对映选择性进行的有机催化反应中很少使用。在我们的实验中,我们发现在使用原位生成的环状 N-酰基亚胺离子的有机催化曼尼希型反应中,将这些化合物用作可烯醇化(亲核)组分会产生低非对映选择性和低至中等的对映选择性值。这种相对于简单脂肪醛的面部选择性显着下降已通过密度泛函理论 (DFT) 计算得到合理化。