Silyl imine electrophiles in enantioselective catalysis: a Rosetta Stone for peptide homologation, enabling diverse N-protected aryl glycines from aldehydes in three steps.

Silyl imine electrophiles in enantioselective catalysis: a Rosetta Stone for peptide homologation, enabling diverse N-protected aryl glycines from aldehydes in three steps.
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DOI:
10.1021/ol501297a
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发表时间:
2014-06-06
期刊:
影响因子:
5.2
通讯作者:
Johnston, Jeffrey N.
Johnston, Jeffrey N.
中科院分区:
化学1区
文献类型:
--
作者:
Makley, Dawn M.;Johnston, Jeffrey N.

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我们报道了N-(三甲基硅基)亚胺在双(氨基)催化的溴甲烷加成反应中具有高度的对映体选择。这允许生产一系列受保护的α-溴硝基烷烃供体(包括Fmoc),用于Umpolung酰胺合成(UmAS)。因此,与非天然芳基甘氨酸氨基酸的肽同源性是由丰富而廉价的芳香醛在三步内实现的。通过避免α-氨基酸中间体,可以避免同源化过程中的外显异构化。
We report that N-(trimethylsilyl)imines serve in the Bis(AMidine)-catalyzed addition of bromonitromethane with a high degree of enantioselection. This allows for the production of a range of protected α-bromo nitroalkane donors (including Fmoc) for use in Umpolung Amide Synthesis (UmAS). Hence, peptide homologation with nonnatural aryl glycine amino acids is achieved in three steps from aromatic aldehydes, which are plentiful and inexpensive. Epimerization during the homologation step is circumvented by avoiding an α-amino acid intermediate.
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