complex to produce a 1 : 1 adduct in high regio- and stereoselectivities. This reaction was extended to various combinations of terminal alkynes with internal alkynes such as alkynylesters and alkynyl aldehydes. The selectivity of the reaction was found to markedly depend on the ligands used. When dppe was used as a ligand, the 1 : 2cross-cyclotrimerization reaction took place to form substituted benzene
Copper-Catalyzed Acyloxycyanation of Alkynes with Acetonitrile: Regioselective Construction of Cyclic Acrylonitriles by 6-<i>endo</i>
or 5-<i>exo</i>
Cyclization
作者:Yamin Zhu、Zengming Shen
DOI:10.1002/adsc.201700577
日期:2017.10.25
difunctionalization of alkynes by tandem iodolactonization and copper‐catalyzedcyanation using acetonitrile as a cyanating reagent is reported for the first time. This approach can afford cyano‐containing isocoumarin or phthalide derivatives in good yields by careful choice of the carboxylate nucleophiles and electrophilic iodine sources. Thus, an acyloxycyanation strategy can be achieved in good yields