A convenient synthesis of peptidyl perfluoroalkyl ketones
作者:Robert J. Cregge、Timothy T. Curran、William A. Metz
DOI:10.1016/s0022-1139(97)00154-1
日期:1998.2
converted directly to the corresponding pentafluoroethyl ketones 6, 9a and 9b. The method was also applied to the synthesis of heptafluoropropyl- and nonafluorobutyl peptidyl ketones 11a and 11b from their corresponding esters, albeit in lower yield. These amino ketones are useful as intermediates in the preparation of peptidyl perfluoroalkyl ketones which have been shown to be potent inhibitors of human
Cladosin C is one of the few known enaminotetramic acids, isolated from extracts of the deep sea fungus Cladosporium sphaerospermum. It was synthesised in ten steps and 14% overall yield by a late-stage amination of the corresponding 3-acyltetramic acid. This was obtained by a Dieckmann condensation of an N-β-ketoacylaminoester derived from dehydrovalinate and the thioester-terminated side chain containing
作者:Gino Occhialini、Vignesh Palani、Alison E. Wendlandt
DOI:10.1021/jacs.1c12043
日期:2022.1.12
The positional isomerization of C═C double bonds is a powerful strategy for the interconversion of alkene regioisomers. However, existing methods provide access to thermodynamically more stable isomers from less stable starting materials. Here, we report the discovery of a dual catalyst system that promotes contra-thermodynamic positional alkeneisomerization under photochemical irradiation, providing
Contra-Thermodynamic Positional Isomerization of Olefins
作者:Kuo Zhao、Robert R. Knowles
DOI:10.1021/jacs.1c11681
日期:2022.1.12
affords an isomerized and less thermodynamically stable alkene product. The higher oxidation potential of the less substituted olefin isomer renders it inert to further oxidation by the excited-state oxidant, enabling it to accumulate in solution over the course of the reaction. A broad range of isopropylidene substrates are accommodated, including enol ethers, enamides, styrenes, 1,3-dienes, and tetrasubstituted