Study on Radical Amidation onto Aromatic Rings with (Diacyloxyiodo)arenes
摘要:
Sulfonamides of primary amines bearing an aromatic ring at the gamma-position were treated with (diacyloxyiodo)arenes and:iodine under irradiation conditions with;a tungsten-lamp to give the corresponding 1,2,3,4-tetrahydroquinoline derivatives in moderate to good yields. Here, the reactivity depends on the Z-group (protecting group) of the starting amides. Under the same reaction conditions, some sulfonamides were treated with (diacetoxyiodo)benzene and iodine in the presence of aromatics to give the corresponding N-arylated amides. These reactions proceed through the intramolecular and intermolecular amidations onto aromatic rings via the sulfonamidyl radicals formed.
Easily Accessible Auxiliary for Palladium-Catalyzed Intramolecular Amination of C(sp<sup>2</sup>)H and C(sp<sup>3</sup>)H Bonds at δ- and ε-Positions
for selectiveCH activation under palladium catalysis. The novel auxiliary showed its first powerful application in CH functionalization of remote positions. Both C(sp2)H and C(sp3)Hbonds at δ‐ and ε‐positions were effectively activated, thus giving tetrahydroquinolines, benzomorpholines, pyrrolidines, and indolines in moderate to excellent yields by palladium‐catalyzed intramolecular CH amination
Iodination of Remote <i>Ortho</i>-C–H Bonds of Arenes via Directed S<sub>E</sub>Ar: A Streamlined Synthesis of Tetrahydroquinolines
作者:William A. Nack、Gang He、Shu-Yu Zhang、Chengxi Lu、Gong Chen
DOI:10.1021/ol4015078
日期:2013.7.5
A new strategy for the synthesis of tetrahydroquinolines (THQs) via the sequential functionalizations of remote C–H bonds is reported. This method uses a single picolinamide directing/protecting group to effect Pd-catalyzed γ-C(sp3)–H arylation, metal-free ε-C(sp2)–H iodination, and Cu-catalyzed intramolecular C–N cross-coupling. The overall sequence is efficient and versatile, and offers a streamlined
Photoredox‐Catalyzed Site‐Selective α‐C(sp
<sup>3</sup>
)−H Alkylation of Primary Amine Derivatives
作者:Melissa A. Ashley、Chiaki Yamauchi、John C. K. Chu、Shinya Otsuka、Hideki Yorimitsu、Tomislav Rovis
DOI:10.1002/anie.201812227
日期:2019.3.18
tertiary amines to oxidatively generate α‐amino radicals is well established, however, primary amines remain challenging because of competitive side reactions. This report describes the site‐selective α‐functionalization of primary amine derivatives through the generation of α‐amino radical intermediates. Employing visible‐light photoredoxcatalysis, primary sulfonamides are coupled with electron‐deficient
Instantaneous Deprotection of Tosylamides and Esters with SmI<sub>2</sub>/Amine/Water
作者:Tobias Ankner、Göran Hilmersson
DOI:10.1021/ol802243d
日期:2009.2.5
SmI2/amine/water mediates instantaneous cleavage of tosyl amides and tosyl esters. Highlyhindered, sensitive and functionalized substrates were successfully deprotected in near quantitative yield.
Facile Preparation of 3,4-Dihydro-2,1-benzothiazine
2,2-Dioxides and Related Reaction with 1,3-Diiodo-5,5-dimethylhydantoin
under Photochemical Conditions
作者:Hideo Togo、Atsushi Moroda、Shusuke Furuyama
DOI:10.1055/s-0028-1216725
日期:——
3,4-Dihydro-2,1-benzothiazine 2,2-dioxides were easily obtained in good yields by the reaction of N-methyl 2-arylethane-sulfonamides with 1,3-diiodo-5,5-dimethylhydantoin (D1H) under irradiation with a tungsten lamp. When N-benzyl 2-phenylethane-sulfonamide was treated with DIH under the same conditions, the corresponding N-benzyl 3,4-dihydro-2,1-benzothiazine 2,2-dioxide was obtained in good yield