Catalytic Syntheses of N-Heterocyclic Ynones and Ynediones by In Situ Activation of Carboxylic Acids with Oxalyl Chloride
作者:Christina Boersch、Eugen Merkul、Thomas J. J. Müller
DOI:10.1002/anie.201103296
日期:2011.10.24
bottleneck: α‐Keto carboxylicacids and N‐heterocyclic carboxylicacids are activated in situ with oxalylchloride then catalytically alkynylated to give ynediones and N‐heterocyclic ynones efficiently in a one‐pot fashion. 5‐Acylpyrazoles and 2‐phenylaminopyrimidines, potentially interesting for pharmaceutical applications, are readily synthesized in concise one‐pot, three‐component syntheses.
Trimethylsilylethynyl Ketones as Surrogates for Ethynyl Ketones in the Double Michael Reaction
作者:Derrick S. Holeman、Ravindra M. Rasne、Robert B. Grossman
DOI:10.1021/jo0163086
日期:2002.5.1
Trimethylsilylethynyl ketones can be desilylated in the presence of a tethered carbon diacid and induced to undergo a double Michaelreaction in situ. The trimethylsilylethynyl ketones can serve as surrogates of ethynyl ketones that are difficult to prepare or isolate.