Nickel(0)-Promoted Carboxylation of Allenamides with Carbon Dioxide via a Nickelalactone Intermediate
摘要:
Nickel(0)-promoted carboxylation of N-allenylamides (allenamides) with carbon dioxide proceeded via a nickelalactone intermediate to give beta-amino acid derivatives. It was also found that the regioselectivity at the oxidative addition stage was strongly affected by the substituents on the allene part.
Regiodivergent Synthesis of 1,3- and 1,4-Enynes through Kinetically Favored Hydropalladation and Ligand-Enforced Carbopalladation
作者:Tapas R. Pradhan、Hong Won Kim、Jin Kyoon Park
DOI:10.1002/anie.201805408
日期:2018.7.26
Pd‐catalyzed hydroalkynylations were developed that involve ligand‐enabled regiodivergent addition of an alkyne to an allenamide, giving branched and linear products stereoselectively and facilitated by the neighboring amide group. Regioselectivity was achieved with the use of (o‐OMePh)3P and BrettPhos, which allowed the functionalization of various alkynes, including steroids, carbohydrates, alkaloids