Catalytic decarboxylative alkylation of β-keto acids with sulfonamides via the cleavage of carbon–nitrogen and carbon–carbon bonds
作者:Cui-Feng Yang、Jian-Yong Wang、Shi-Kai Tian
DOI:10.1039/c1cc12790j
日期:——
An efficient decarboxylative alkylation reaction of β-keto acids with N-benzylic or N-allylic sulfonamides has been developed, for the first time, through sequential cleavage of carbonânitrogen and carbonâcarbon bonds in the presence of 10 mol% of FeCl3.
A gold-catalyzed regiospecific hydration of N-tosyl propargylic amines has been developed. In the presence of a catalytic amount of the gold catalyst NaAuCl4·2H2O, both alkyl and aryl-substituted N-tosyl propargylic amines were smoothly converted into the corresponding β-amino ketones with excellent regioselectivities and high yields (up to 85%). Further transformations of the obtained β-amino ketones
Selective Benzylic and Allylic Alkylation of Protic Nucleophiles with Sulfonamides through Double Lewis Acid Catalyzed Cleavage of sp<sup>3</sup>Carbon-Nitrogen Bonds
broad range of tosyl‐activated benzylic and allylic amines to give diversely functionalized products in good to excellent yields and with high regioselectivity. Furthermore, the cross‐coupling reaction of 1,3‐dicarbonyl compounds with benzylic propargylicamine derivatives has been successfully applied to the one‐step synthesis of polysubstituted furans and benzofurans.
Stereospecific Synthesis of Fluoroalkenes by Silver-Mediated Fluorination of Functionalized Alkenylstannanes
作者:Heiko Sommer、Alois Fürstner
DOI:10.1002/chem.201605444
日期:2017.1.12
sorts. Key to success is the use of F‐TEDA‐PF6 in combination with non‐hygroscopic and bench‐stable silver phosphinate (AgOP(O)Ph2) that acts as an essentially neutral, non‐nucleophilic promotor and effective tin‐scavenger at the same time. This new method opens many opportunities for late‐stage fluorination of elaborate compounds far beyond the scope of the literature procedures, as witnessed by the preparation
alkylation of sulfinicacids with sulfonamides has been developed via sp3 C−N bond cleavage at room temperature. In the absence of external catalysts and additives, a wide variety of N-benzylic and N-allylic sulfonamides couple with sulfinicacids to give structurally diversified sulfones in moderate to excellent yields. Furthermore, the reaction of N-(2-acyl)allylic sulfonamides with sulfinicacids provides