Photoinduced homolytic decarboxylative acylation/cyclization of unactivated alkenes with α-keto acid under external oxidant and photocatalyst free conditions: access to quinazolinone derivatives
作者:Bin Sun、Rongcheng Shi、Kesheng Zhang、Xiaoli Tang、Xiayue Shi、Jiayun Xu、Jin Yang、Can Jin
DOI:10.1039/d1cc02415a
日期:——
A novel and green strategy for the synthesis of acylated quinazolinone derivatives via photo-induced decarboxylative cascade radical acylation/cyclization of quinazolinone bearing unactivated alkenes has been developed. The protocol provides a novel route to access acyl radicals from α-keto acids through a self-catalyzed energy transfer process. Most importantly, the reaction proceeded smoothly without
Reductive Synthesis of Aminal Radicals for Carbon–Carbon Bond Formation
作者:David A. Schiedler、Yi Lu、Christopher M. Beaudry
DOI:10.1021/ol500024q
日期:2014.2.21
Aminal radicals were generated by reduction of the corresponding amidine or amidinium ion. The intermediate radicals participate in C–C bond-forming reactions to produce fully substituted aminal stereocenters. No toxic additives or reagents are required. More than 30 substrate combinations are reported, and chemical yields are as high as 99%.
Photo‐Triggered Self‐Induced Homolytic Dechlorinative Sulfonylation/Cyclization of Unactivated Alkenes: Synthesis of Quinazolinones Containing a Sulfonyl Group
A self-photocatalyzed sulfonylation/cyclization of quinazolinonescontainingunactivatedalkenes with various sulfonyl chlorides was developed. The protocol provides access to sulfonyl radicals via energy transfer from the quinazolinone skeleton to the sulfonyl chloride. Notably, the transformations proceeded without any external photocatalysts, additives, or oxidants, providing an alternative method
The development of carbon–carbon bond forming reactions of aminal radicals
作者:David A. Schiedler、Jessica K. Vellucci、Yi Lu、Christopher M. Beaudry
DOI:10.1016/j.tet.2014.12.067
日期:2015.3
Aminal radicals were generated and used in synthetic reactions for the first time. Aminal radicals are formed from aminals by radical translocation using AIBN and a stoichiometric hydrogen atom donor, or by SmI2 reduction of N-acyl amidines or amidinium ions in the presence of a proton source. Aminal radicals were found to participate in inter- and intramolecular C–C bondformingreactions with electron
An atom and step economy cascadetrifluoromethylation/cyclization of unactivatedalkene with Langlois reagent as a CF3 source is described. A variety of polycyclicquinazolinones were successfully synthesized in 52–81% yields under transition metal- and oxidant-free conditions. The Langlois reagent used in this strategy as a CF3 reagent possesses the advantages of bench-stablity, cost-effectivity and