Chiral allene-containing phosphines in asymmetric catalysis.
Chiral allene-containing phosphines in asymmetric catalysis.
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DOI:
10.1021/ja207748r
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发表时间:
2011-11-16
影响因子:
15
通讯作者:
Ready, Joseph M.
中科院分区:
文献类型:
--
作者:
Cai, Feng;Pu, Xiaotao;Qi, Xiangbing;Lynch, Vincent;Radha, Akella;Ready, Joseph M.
Traditionally, ligands used in asymmetric catalysis have contained either stereogenic atoms or hindered single bonds (atropisomerism), or both. Here we demonstrate that allenes, chiral 1,2-dienes, appended with basic functionality can serve as ligands for transition metals. We describe an allene-containing bisphosphine that, when coordinated to Rh(I), promotes the asymmetric addition of aryl boronic acids to α-keto esters with high enantioselectivity. Solution and solid-state structural analysis reveals that one olefin of the allene can coordinate to transition metals generating bi- and tri-dentate ligands.
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