http://pubs.acs.org/doi/abs/10.1021/ja1047494


http://pubs.acs.org/doi/abs/10.1021/ja105010t


http://pubs.acs.org/doi/abs/10.1021/ol101318t


http://pubs.acs.org/doi/abs/10.1021/ol101221c


http://pubs.acs.org/doi/abs/10.1021/ol101152b

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多谢！