Tertiary, benzyl, and allylic nitro compounds undergo nuclephilic substitutionreactions with carbonnucleophiles such as electron rich aromatic compounds, allylsilanes, or silyl enol ethers in the presence of SnCl4.
thermodynamically-stable isomers is negligible. On the other hand, the palladium-catalyzed sulfonylation of allylic acetates with sodium benzenesulfinate is accompanied by the isomerization to give the thermodynamically-controlled products selectively. These results can be explained by assuming that allylic nitro compounds are more reactive to the palladium catalyst than allylic acetates and sulfones.
Regioselective Monoalkylation of Ketones with Allylic Nitro Compounds
作者:Noboru Ono、Isami Hamamoto、Aritsune Kaji
DOI:10.1246/bcsj.58.1863
日期:1985.6
Lithium enolates from 2-methylcyclohexanone and p-methylacetophenone react with allylicnitrocompounds in the presence of triethylborane (2 equiv) and Pd(PPh3)4 (5 mol%) to give monoallylated compounds regioselectively.
Allylicnitrocompounds are directly converted into allylsulphides or allylsulphones with high regioselectivity on treatment with sodium benzenethiolate alone or with sodium benzenesulphinate in the presence of a catalytic amount of Pd(PPh3)4.
Regioselective synthesis of allylic sulfones by palladium-catalyzed denitro-sulfonylation of allylic nitro compounds
作者:Rui Tamura、Koji Hayashi、Masato Kakihana、Masanori Tsuji、Daihei Oda
DOI:10.1016/s0040-4039(00)61946-9
日期:1985.1
Allylicnitrocompounds undergo denitro-sulfonylation catalyzed by Pd(PPh3)4 or Pd(PPh3)4 +NaNO2 with PhSO2Na·2H2O to afford allylic sulfones regioselectively.