Regioselectivity in the Intramolecular Heck Reaction of a Series of Cyclic Sulfonamides: An Experimental and Computational Study
作者:Kimberly Geoghegan、Paul Evans、Isabel Rozas、Ibon Alkorta
DOI:10.1002/chem.201201359
日期:2012.10.15
Regioselectivity in the intramolecular Heck reaction of a series of N‐sulfonyl‐2,5‐dihydro‐3‐substituted pyrroles was studied. These substrates are unbiased in terms of the formed ring size of the new heterocycle. Results indicate that high levels of regioselectivity are observed under a range of conditions, and that there is an underlying propensity for carbon–carbon bond formation at the most hindered
研究了一系列N-磺酰基-2,5-二氢-3-取代吡咯在分子内Heck反应中的区域选择性。这些衬底在新杂环形成的环尺寸方面没有偏见。结果表明,在一定条件下观察到了很高的区域选择性,并且在烯烃最受阻的末端存在潜在的碳-碳键形成趋势。对于两个示例(3 Me和3 t Bu),进行了DFT计算,结果表明,在这两种情况下,对于碳酸盐的建模过渡态,对于实验上优选的异构体,在能量上都较低。