Enantioselective Synthesis of 3-Azabicyclo[4.1.0]heptenes and 3-Azabicyclo[3.2.0]heptenes by Ir-Catalyzed Asymmetric Allylic Amination of<i>N</i>-Tosyl Propynylamine and Pt-Catalyzed Cycloisomerization
作者:Ji-Bao Xia、Wen-Bo Liu、Tian-Min Wang、Shu-Li You
DOI:10.1002/chem.201000467
日期:2010.6.11
Irresistible! Highly regio‐ and enantioselective Ir‐catalyzed allylicamination reactions of N‐tosyl propynylamines have been realized. The resulting N‐tosyl allylpropynylamines were transformed into highly enantioenriched 3‐azabicyclo[4.1.0]heptenes and 3‐azabicyclo[3.2.0]heptenes, respectively, in the presence of PtCl2 (see scheme; Ts=tosyl, cod=1,5‐cyclooctadiene, TBAF=tetrabutylammonium fluoride
Selectivities in Nickel-Catalyzed Hydrocarboxylation of Enynes with Carbon Dioxide
作者:Tao Cao、Zheng Yang、Shengming Ma
DOI:10.1021/acscatal.7b00556
日期:2017.7.7
A three-component hydrocarboxylation of enynes with ZnEt2 and CO2 is realized. Highly selective cyclizative carboxylation of the C–C triple bond was observed. Preliminary mechanistic studies indicated both the concerted cyclometalation mechanism and the stepwise C═C bond-directed carboxylation were possible in this reaction.