Designing ‘Totem’<i>C<sub>2</sub></i>-Symmetrical Iron Porphyrin Catalysts for Stereoselective Cyclopropanations
作者:Daniela Maria Carminati、Daniela Intrieri、Alessandro Caselli、Stéphane Le Gac、Bernard Boitrel、Lucio Toma、Laura Legnani、Emma Gallo
DOI:10.1002/chem.201602289
日期:2016.9.12
The catalytic activity of the iron(III) C2 chiral porphyrin Fe(2)(OMe) in alkene cyclopropanation is herein reported. The catalyst promoted the reaction of differently substituted styrenes with diazo derivatives with trans‐diastereoselectivities and enantioselectivities up to 99:1 and 87 %, respectively. In addition, high TON and TOF values (up to 10 000 and 120 000 h−1, respectively) were observed
本文报道了铁(III)C 2手性卟啉Fe(2)(OMe)在烯烃环丙烷化中的催化活性。该催化剂促进与重氮衍生物不同取代的苯乙烯的反应反分别为1个87%,:-diastereoselectivities和对映选择性高达99。另外,观察到高的TON和TOF值(分别高达10000和120000h -1),表明催化剂在优化的实验条件下具有良好的活性和稳定性。对环丙烷化反应的研究表明,卟啉骨架是由两个图腾组成的独立负责观察到的对映异构和非对映异构选择性的部分。为了进一步研究,我们还研究了与铁原子配位的甲氧基轴向配体的催化作用。Fe(2)(OMe)的分子结构通过DFT计算进行了优化,该计算还用于更好地理解卡宾转移反应的机理细节。