UV Light-Mediated Difunctionalization of Alkenes through Aroyl Radical Addition/1,4-/1,2-Aryl Shift Cascade Reactions
摘要:
UV light-mediated difunctionalization of alkenes through an aroyl radical addition/1,4-/1,2-aryl shift has been described. The resulted aroyl radical from a photocleavage reaction added to acrylamide compounds followed by cyclization led to the formation of oxindoles, whereas the addition to cinnamic amides aroused a unique 1,4-aryl shift reaction. Furthermore, the difunctionalization of alkenes of prop-2-en-1-ols was also achieved through aroyl radical addition and a sequential 1,2-aryl shift cascade reaction.
Oxindole synthesis by palladium-catalysed aromatic C–H alkenylation
作者:Satoshi Ueda、Takahiro Okada、Hideko Nagasawa
DOI:10.1039/b926560k
日期:——
A strategy involving palladium-catalysed aromatic C-H functionalisation/intramolecular alkenylation provides a convenient and direct synthesis of 3-alkylideneoxindoles. In the presence of 5 mol% of PdCl(2)MeCN(2) and AgOCOCF(3), a wide variety of N-cinnamoylanilines gave 3-alkylideneoxindoles in moderate to good yield.
Fe-Catalyzed decarbonylative cascade reaction of <i>N</i>-aryl cinnamamides with aliphatic aldehydes to construct 3,4-dihydroquinolin-2(1<i>H</i>)-ones
A practical Fe-catalyzed decarbonylative cascade reaction of N-aryl cinnamamides with aliphaticaldehydes to provide C3 alkylated 3,4-dihydroquinolin-2(1H)-ones is developed. Aliphaticaldehydes were oxidatively decarbonylated into 1°, 2° and 3° alkyl radicals conveniently, allowing for the subsequent cascade construction of C(sp3)-C(sp3) and C(sp3)-C(sp2) bonds via radical addition and HAS-type cyclization
Palladium-Catalyzed [3+3] Annulation between Diarylamines and α,β-Unsaturated Acids through CH Activation: Direct Access to 4-Substituted 2-Quinolinones
作者:Rajesh Kancherla、Togati Naveen、Debabrata Maiti
DOI:10.1002/chem.201500774
日期:2015.6.1
A CHactivation strategy has been successfully employed for the high‐yielding synthesis of a diverse array of 4‐substituted2‐quinolinone species by a palladium‐catalyzed dehydrogenative coupling involving diarylamines. This intermolecular annulation approach incorporates readily available α,β‐unsaturated carboxylic acids as the couplingpartner by suppressing the facile decarboxylation. Based on
AC ħ激活策略已被成功地用于通过涉及二芳基胺钯催化脱氢偶联高产合成4-取代的2-喹啉酮物种的多样性阵列的。这种分子间环化方法通过抑制容易的脱羧作用,结合了易于获得的α,β-不饱和羧酸作为偶联伴侣。在初步的机理研究的基础上,提出了一个反应顺序,包括邻,π-配位,β-迁移插入和β-氢化物消除。
Potassium Base‐Catalyzed Michael Additions of Allylic Alcohols to α,β‐Unsaturated Amides: Scope and Mechanistic Insights
作者:Masahiro Sai、Hiroaki Kurouchi
DOI:10.1002/adsc.202100272
日期:——
We report herein the first KHMDS-catalyzed Michaeladditions of allylic alcohols to α,β-unsaturated amides through allylic isomerization. The reaction proceeds smoothly in the presence of only 5 mol% of KHMDS to afford a variety of 1,5-ketoamides in high yields. Mechanistic investigations, including experimental and computational studies, reveal that the KHMDS-catalyzed in-situ generation of the enolate
A new radical-mediated intramolecular arene C(sp2)-H amidation of 3-phenylpropanamides or [1,1'-biphenyl]-2-carboxamides was developed to prepare a series of 3,4-dihydro-2(1H)-quinolinone and phenanthridone derivatives in moderate to excellent yields (33-94%). Spirolactams could also be obtained using this protocol.