anhydride/2-fluoropyridine as an activation system, the couplingreactions of secondary N-aryl amides with terminal alkynes yielded substituted quinolines in moderate to excellent yields. The reaction tolerated both electron-donating and electron-withdrawing groups at the benzamide moiety. Electron-rich aryl acetylenes served as excellent coupling partners, and aliphatic terminal alkynes such as cyclopropyl
Reaction of arylacetylenes with C,N-diarylnitrones is effectively catalysed by copper(I) iodide-dppe [1,2-bis(diphenylphosphino)ethane] in the presence of potassium carbonate to give the corresponding 1-azabut-1-en-3-yne (iminopropyne) derivatives in good yield.
we report that, undermicrowave irradiation, the CeCl3·7H2O/NaI/I2 system is capable of promoting a 5-exo-dig cyclization of propargyl amides with good functional group tolerance. The microwave reactor also provides a more convenient and safer method for heating the reaction. This methodology represents a straightforward CeCl3·7H2O/NaI/I2 promoted cyclization using microwave irradiation to accomplish
A Convenient Palladium-Catalyzed Synthesis of Alkynyl Substituted Schiff's Bases by Coupling of Imidoyl Chlorides with 1-Alkynes
作者:Shou-Yuan Lin、Huai-Yu Sheng、Yao-Zeng Huang
DOI:10.1055/s-1991-26432
日期:——
Alkyne substituted Schiff's bases 3 for example N-(1-phenyl-2-hexynylidene)aniline (3e), were conveniently synthesized from imidoyl chlorides 1 and 1-alkynes 2 in the presence of a palladium catalyst.