Practical approaches to labelling terminal alkynes with deuterium
作者:Melanie Y. T. Chan、Arbab Anwar、William J. S. Lockley
DOI:10.1002/jlcr.3963
日期:2022.4
Base catalysed exchange with sodium hydroxide, calcium oxide or N,N,N,N-tetramethylguanidine in deuterium oxide is a viable procedure for the preparation of terminally deuterated alkynes for those alkynes stable to strong base. The use of silver perchlorate as a catalyst is an alternative practical option when labelling alkynes which are sensitive to base or contain functionalities which would lead to labelling elsewhere in the molecule. Labelling with this catalyst takes place smoothly at ambient temperature in a mixture of N,N-dimethylformamide and deuterium oxide.
Silver-Catalyzed Cross-Coupling of Propargylic Alcohols with Isocyanides: An Atom-Economical Synthesis of 2,3-Allenamides
作者:Jianquan Liu、Zhenhua Liu、Nannan Wu、Peiqiu Liao、Xihe Bi
DOI:10.1002/chem.201304255
日期:2014.2.17
Cross‐coupling reactions between propargylicalcohols and isocyanides, by means of silver catalysis, have been described. This new reaction is both atom and step efficient and is applicable to a broad scope of substrates, allowing the synthesis of a range of synthetically valuable 2,3‐allenamides in moderate to excellent yields.