Synthesis of α-amino acid derivatives and peptides via enantioselective addition of masked acyl cyanides to imines.
Synthesis of α-amino acid derivatives and peptides via enantioselective addition of masked acyl cyanides to imines.
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DOI:
10.1021/ja510135t
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发表时间:
2014-11-19
影响因子:
15
通讯作者:
Rawal, Viresh H.
中科院分区:
文献类型:
--
作者:
Yang, Kin S.;Rawal, Viresh H.
A general, asymmetric synthesis of amino acid derivatives is reported. Masked acyl cyanide (MAC) reagents are shown to be effective umpolung synthons for enantioselective additions to N-Boc-aldimines. The reactions are catalyzed by a modified cinchona alkaloid, which can function as a bifunctional, hydrogen bonding catalyst, and afford adducts in excellent yields (90–98%) and high enantioselectivities (up to 97.5:2.5 er). Unmasking the addition products gives acyl cyanide intermediates that are intercepted by a variety of nucleophiles to afford α-amino acid derivatives. Notably, the methodology provides an alternative method for peptide bond formation.
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