Selectivity in Garratt−Braverman Cyclization: An Experimental and Computational Study
作者:Manasi Maji、Dibyendu Mallick、Sayantan Mondal、Anakuthil Anoop、Subhendu Sekhar Bag、Amit Basak、Eluvathingal D. Jemmis
DOI:10.1021/ol102861j
日期:2011.3.4
Bispropargyl sulfones equipped with aromatic rings of dissimilar nature were synthesized. Under basic conditions, these sulfones isomerized to the bisallenic sulfones, creating a competitive scenario between two alternate Garratt−Braverman (GB) cyclization pathways. The observed product distribution ruled out the involvement of any ionic intermediate and supported the diradical mechanism with greater
合成了具有不同性质的芳环的双炔丙基砜。在基本条件下,这些砜异构化为双亚烯砜,在两个替代的Garratt-Braverman(GB)环化途径之间创造了竞争格局。观察到的产物分布排除了任何离子中间体的参与,并通过更多的亲核基团支持了富电子的芳环的更大参与的双自由基机理。基于DFT的计算支持双自由基机理以及观察到的选择性。