A new procedure for the reductive desulfonylation of β-keto sulfones is described. The reaction proceeds under a photochemical conditions with the Hantzschester in pyridine in the presence of ruthenium(II). Various functional groups are unaffected under the reaction conditions. Application of the procedure to the syntheses of certain natural products is also described.
描述了一种用于 β-酮砜还原脱磺酰化的新程序。在钌 (II) 存在下,该反应在光化学条件下与在吡啶中的 Hantzsch 酯进行。各种官能团在反应条件下不受影响。还描述了该程序在某些天然产物合成中的应用。
DESULFONYLATION OF β-KETO SULFONES WITH THE HANTZSCH ESTER, AN NAD(P)H MODEL
The C−C bond formation between active methylene compounds and allylic alcohols has been newly developed by using a palladium complex as a catalyst together with a phosphine‐borane ligand. The best phosphine‐borane ligand for this direct allylation has been revealed to be Ph2P(CH2)4(9‐BBN) to produce a variety of desirable allylated products in high yields.
Direct allylic substitution of allyl alcohols by carbon pronucleophiles in the presence of a palladium/carboxylic acid catalyst under neat conditions
作者:Nitin T. Patil、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2004.02.094
日期:2004.4
The reaction of allylicalcohols with carbon pronucleophiles in the presence of the Pd(PPh3)4/carboxylic acid combined catalytic system, under neat conditions (without an organic solvent or without water as the solvent) enabled the direct allylation of the pronucleophiles, giving the corresponding allylated products in high yields.
Photoinduced electron-transfer reaction between excited β-ketosulfones and ascorbic acid provides an efficient and green approach for the desulfonylation of β-ketosulfones.