The utilization of N-trifluoroacetyl (TFA)-alpha-amino acid N-hydroxysuccinimide ester (OSu) derivatives, a promising acylating agent with high storage stability, is reported for Friedel Crafts acylation into arenes and N-heterocycles. The reaction between TFA-Phe-OSu derivatives and arenes afforded inter- and intramolecular products. TFA-Tyr-OSu derivatives, which possess hydroxyl substituent in the aromatic moiety of phenylalanine, afforded only intermolecular product with benzene. The heterocyclic TFA-Pro-OSu also shows relatively high reactivity toward acylation.
A General Approach to Stereospecific Cross-Coupling Reactions of Nitrogen-Containing Stereocenters
作者:Xinghua Ma、Haoran Zhao、Meruyert Binayeva、Glenn Ralph、Mohamed Diane、Shibin Zhao、Chao-Yuan Wang、Mark R. Biscoe
DOI:10.1016/j.chempr.2020.02.002
日期:2020.3
A novel strategy employing cyclohexyl spectator ligands in Stille cross-coupling reactions has been developed as a general solution to the long-standing challenge of conducting stereospecific cross-coupling reactions at nitrogen-containing stereocenters. This method enables direct access to enantioenriched products that are difficult (or impossible) to obtain via alternative preparative methods. Selective
The utilization of N-trifluoroacetyl (TFA)-alpha-amino acid N-hydroxysuccinimide ester (OSu) derivatives, a promising acylating agent with high storage stability, is reported for Friedel Crafts acylation into arenes and N-heterocycles. The reaction between TFA-Phe-OSu derivatives and arenes afforded inter- and intramolecular products. TFA-Tyr-OSu derivatives, which possess hydroxyl substituent in the aromatic moiety of phenylalanine, afforded only intermolecular product with benzene. The heterocyclic TFA-Pro-OSu also shows relatively high reactivity toward acylation.
N-(Trifluoroacetyl)-.alpha.-amino acid chlorides as chiral reagents for Friedel-Crafts synthesis
作者:J. Eric Nordlander、F. George Njoroge、Mark J. Payne、Dhiraj Warman