Synthesis of Amide Enol Carbamates and Carbonates through Cu(OTf)<sub>2</sub>-Catalyzed Reactions of Ynamides with <i>t</i>-Butyl Carbamates/Carbonates
作者:Pan Han、Zhuo-Ya Mao、Ming Li、Chang-Mei Si、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1021/acs.joc.9b03512
日期:2020.4.3
A highly regioselective approach to access amide enol carbamates and carbonates 5a–5c′, 7a–7h, and 9 was developed through Cu(OTf)2-catalyzed reactions of ynamides 4 with t-butyl carbamates 2 and 8 and t-butyl carbonates 6. Moreover, this strategy was successfully applied to generate amide enol carbamates 11a–11s and 14a–14f from imides 10 and 13 with ynamides through an N-Boc cleavage–addition ring-opening
Synthesis of 2-Aza-1,3-butadienes through Gold-Catalyzed Intermolecular Ynamide Amination/C–H Functionalization
作者:Chao Shu、Cang-Hai Shen、Yong-Heng Wang、Long Li、Tao Li、Xin Lu、Long-Wu Ye
DOI:10.1021/acs.orglett.6b02267
日期:2016.9.16
A novel gold-catalyzed tandem intermolecular ynamide amination/C–H functionalization has been developed. A variety of highly functionalized 2-aza-1,3-butadienes can be obtained readily by utilizing this strategy. In addition, α-imino gold carbene intermediates are proposed in this amination reaction and with support by DFT (density functional theory) calculations.
A Modular Synthesis of 4-Aminoquinolines and [1,3] N-to-C Rearrangement to Quinolin-4-ylmethanesulfonamides
作者:Kyung Hwan Oh、Jin Gyeong Kim、Jin Kyoon Park
DOI:10.1021/acs.orglett.7b01701
日期:2017.8.4
diversified 4-aminoquinolines using nitriles, diaryliodoniums, and ynamides. The C7-substituted regioisomers were formed regioselectively when meta-substituted phenyliodonium salts were used. [1,3] N-to-C rearrangement of the products to quinolin-4-ylmethanesulfonamides and simultaneous deprotection of benzyl and sulfonamide group were newly developed. Finally, antimalarial CK-2-68 was successfully prepared
Stereoselective Synthesis of (2<i>Z</i>)-2,4-Dienamides via NBS-Mediated Allyloxyl Addition–Claisen Rearrangement–Dehydrobromination Cascade Reaction of Ynsulfonamides
An NBS-promoted allyloxyl addition-Claisen reatrangement-dehydrobtomination cascade reaction has been developed. More than 20 substituted alkynylsulfonamides were reacted with allyl alcohols to generate (2Z)-2,4-dienamides in moderate to high yields. A mechanistic model has been proposed to account for the overall reaction sequence including the stereochemical outcome. Theoretical calculations suggested that a [3,3] sigmatropic rearrangement be the rate-limiting step.
Iron-Catalyzed Amidation of Alkynyl Bromides: A Facile Route for the Preparation of Ynamides
A facile route to obtain ynamides in high yields was described. The products were achieved through the iron-catalyzed C-N coupling reaction of amides with alkynyl bromides in the presence of 20 mol % of N,N'-dimethylethane-1,2-diamine (DMEDA).