Catalytic Cleavage of C(<i>sp</i><sup>2</sup>)–C(<i>sp</i><sup>2</sup>) Bonds with Rh-Carbynoids
作者:Zhaofeng Wang、Liyin Jiang、Pau Sarró、Marcos G. Suero
DOI:10.1021/jacs.9b08632
日期:2019.10.2
We report a catalytic strategy that generates rhodium-carbynoids by selective diazo activation of designed carbyne sources. We found that rhodium-carbynoid species provoke C(sp2)-C(sp2) bond scission in alkenes by inserting a monovalent carbon unit between both sp2-hybridized carbons. This skeletal remodeling process access synthetically useful allyl cation intermediates that conduct to valuable allylic
Synthesis of variously 2-substituted alkyl (Z)- and (E)-2-alkenoates and (Z)- and (E)-α-ylidene-γ-butyrolactones via palladium-mediated cross-coupling reactions between organostannanes and organic halides
作者:Fabio Bellina、Adriano Carpita、Massimo De Santis、Renzo Rossi
DOI:10.1016/s0040-4020(01)89314-5
日期:1994.1
2-(1-alkenyl) as well as 2-acyl substituted α,β-unsaturatedesters, is based on the cross-coupling reaction between easily available alkyl (Z)- or (E)-2-halo-2-alkenoates and organostannanes in NMP, in the presence of catalytic amounts of PdCl2(PhCN)2, AsPh3 and CuI. (Z)-and (E)-2-ethenyl substituted α,β-unsaturatedesters prepared according to this procedure have been proven to be useful precursors to (Z)-
Highly regioselective palladium-mediated synthesis of stereoisomerically pure (Z)- and (E)-alkyl 2-bromo-3-(hetero)arylpropenoates
作者:Fabio Bellina、Adriano Carpita、Massimo De Santis、Renzo Rossi
DOI:10.1016/0040-4039(94)85040-2
日期:1994.9
Stereoisomericallypure (Z)- and (E)-alkyl2-bromo-3-(hetero)arylpropenoates, (Z)- and (E)-2, have been efficiently and selectively prepared by Pd(0)-mediated cross-coupling reaction between (hetero)arylzinc halides, 5, and easily available (Z)- and (E)-alkyl 2,3-dibromopropenoates, (Z)- and (E)-4, respectively. Compounds (Z)- and (E)-2 serve as useful precursors to stereoisomericallypure trisubstituted