photocatalytic protocol enabling the formation of secondary amides from electron-poor organic bromides and isocyanides was developed. In addition, the in situ interception of ketenimine intermediates with nitrogen nucleophiles such as amines, hydrazines, and TMSN3 afforded, in a one-pot two-step procedure, valuable scaffolds such as ketene aminals, pyrazolones, and tetrazoles. Mechanistic evidence confirmed
TMSCl as a Rate-Accelerating Additive in Acylations of Amines with 5-(<font>α</font>-Amino-<font>α</font>′-hydroxy)methylene Meldrum Acids
作者:Karolina Janikowska、Sławomir Makowiec
DOI:10.1080/00397911.2010.533805
日期:2012.4.1
hylene Meldrumacids. We placed special emphasis on the acylation reaction of secondary amines with 5-(α-amino-α′-hydroxy)methylene Meldrumacids, which, because of their basicity, caused problems concerning salt formation with a Meldrumacid derivative. We found that secondary amines, which react at the slowest rate and give a poor yield with 5-(α-amino-α′-hydroxy)methylene Meldrum'sacid, react quickly
2-(1,3-Dithiol-2-ylidene)-2-[N-(substituted) carbamoly] acetate esters and salts thereof, having good therapeutic or prophylactic effect for hepatic disorder; are provided. Processes for their preparation and intermediates in their preparation also are disclosed.