oxindole synthesis bearing an all-carbon quaternary center, enabled by Pd-catalyzed intramolecular cyclization followed by multiple intermolecular Heck reactions of both easily accessible alkene-tethered carbamoyl chlorides and olefins. This protocol obviates the use of prefunctionalized olefinic reagents, exhibits excellent functional group tolerance, and features fascinating reactive versatility.
Novel synthesis of oxindoles from carbamoyl chlorides via palladium catalysed cyclisation–anion capture
作者:Mark R. Fielding、Ronald Grigg、Christopher J. Urch
DOI:10.1039/b006765m
日期:——
The synthesis of 3,3-disubstituted and 3-methyleneoxindoles by
palladium(0) catalysed cyclisation of carbamoyl chlorides onto
proximate alkene or alkyne groups has been achieved in good yields.
Palladium-catalyzed cascade reactions of alkene-tethered carbamoyl chlorides with <i>N</i>-tosyl hydrazones: synthesis of alkene-functionalized oxindoles
A palladium-catalyzed cascade reaction of alkene-tethered carbamoylchlorides with N-tosyl hydrazones is described. It provided a new way to synthesize various alkene-functionalized oxindoles bearing an all-carbon quaternary center. The olefin moieties could serve as versatile handles for further elaboration. This transformation was highly efficient and showed good functional group tolerance.
Palladium‐Catalyzed Carbamoyl‐Carbamoylation/ Carboxylation/Thioesterification of Alkene‐Tethered Carbamoyl Chlorides Using Mo(CO)
<sub>6</sub>
as the Carbonyl Source
ation/thioesterification of alkene-tethered carbamoyl chlorides using Mo(CO)6 as the carbonyl source. The reactions were typically performed with good functional group compatibility and tolerated different nucleophiles (amines, alcohols, phenols, thiols and water), which provided a newaccess to amidated/esterificated/thioesterificated/carboxylated oxindoles or lactams bearing an all-carbon quaternary
我们报道了使用 Mo(CO) 6作为羰基源的烯烃系链氨基甲酰氯的钯催化的氨基甲酰-氨基甲酰化/羧化/硫酯化。该反应通常以良好的官能团相容性和耐受不同的亲核试剂(胺、醇、酚、硫醇和水)进行,这为获得酰胺化/酯化/硫酯化/羧化羟吲哚或内酰胺提供了新途径无 CO 气体条件。此外,天然产物突变和不同的后期衍生化是重要的实用特征。
Palladium‐Catalyzed Phosphoryl‐Carbamoylation of Alkenes: Construction of Nonbenzylic C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−P(O)R
<sub>2</sub>
Bonds via C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−Pd(II)−P(O)R
<sub>2</sub>
Reductive Elimination
We report the first example of palladium‐catalyzed phosphoryl‐carbamoylation of alkene‐tethered carbamoyl chlorides with P(O)H compounds. Both H‐phosphinates and secondary phosphine oxides are compatible with this reaction. DPE‐Phos was used as ligand to facilitate nonbenzylic C(sp3 )−P bonds formations via C(sp3 )−Pd(II)−P reductive elimination. By using this protocol, a range of phosphorylated