Uncovering Subtle Ligand Effects of Phosphines Using Gold(I) Catalysis.
Uncovering Subtle Ligand Effects of Phosphines Using Gold(I) Catalysis.
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DOI:
10.1021/acscatal.7b00757
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发表时间:
2017-06-02
期刊:
影响因子:
12.9
通讯作者:
Toste FD
中科院分区:
文献类型:
--
作者:
Christian AH;Niemeyer ZL;Sigman MS;Toste FD
Herein, we report the integration of simple linear regressions with gold(I) catalysis to interrogate the influence of phosphine structure on metal-catalyzed organic transformations. We demonstrate that observed product ratios in [4 + 3]/[4 + 2] cycloisomerization processes are influenced by both steric and electronic properties of the phosphine, which can be represented by the Au-Cl distance. In contrast, the observed selectivity of a similar [2 + 3]/[2 + 2] cycloisomerization is governed by L/B1, a steric parameter. Using this correlation, we were able to accurately predict the selectivity of a previously untested, Buchwald-type ligand to enhance selectivity for the same transformation. This ligand found further utility in increasing the selectivity of a previously reported gold-catalyzed cycloisomerization/arylation of 1,6-enynes by ~1 kcal/mol.
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