Amide/Ester Cross-Coupling via C–N/C–H Bond Cleavage: Synthesis of β-Ketoesters
作者:Jiajia Chen、Devaneyan Joseph、Yuanzhi Xia、Sunwoo Lee
DOI:10.1021/acs.joc.0c02868
日期:2021.4.16
Activated primary, secondary, and tertiary amides were coupled with enolizable esters in the presence of LiHMDS to obtain good yields of β-ketoesters at room temperature. Notably, this protocol provides an efficient, mild, and high chemoselectivity method to synthesis of β-alkylketoesters using the cross-coupling between aliphatic amides and esters. Meanwhile, gram-scale secondary and primary amides reacted
Amides Activation: Transition Metal‐Free Coupling Between
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Activated Amides and Enolizable Amides
作者:Devaneyan Joseph、Min Seok Oh、Aravindan Jayaraman、Sunwoo Lee
DOI:10.1002/bkcs.12371
日期:2021.10
Transition metal-free Claisen-type condensation between two different amides was developed. N-phenyl-N-tosylbenzamide derivatives reacted with enolizable amides such as N-methyl pyrrolidinone and N,N-dimethyl acetamide in the presence of NaHMDS to give their corresponding β-ketoamides with moderate-to-good yields.
Synthesis of (Hetero)Aroyl Fluorides via a Mild Amides C−N Bond Cleavage
作者:Muhammad Aliyu Idris、Kwang Ho Song、Sunwoo Lee
DOI:10.1002/adsc.202200275
日期:2022.7.19
provide the corresponding acyl fluorides in good yields. The reaction was conducted under environmentally friendly conditions using i-PrOAc as the solvent. Moreover, the reaction was performed at room temperature and did not require a transition-metal catalyst or additives. The methodology showed functional group tolerance toward amines, alkoxy, halides, ketones, esters, and aldehydes.
酰胺,例如N-苯甲酰糖精、 N,N-二苯甲酰胺和N-苯基-N-甲苯磺酰苯甲酰胺与 Et 3 N·3HF 反应以良好的收率提供相应的酰氟。该反应在环境友好的条件下使用i- PrOAc 作为溶剂进行。此外,该反应在室温下进行,不需要过渡金属催化剂或添加剂。该方法显示官能团对胺、烷氧基、卤化物、酮、酯和醛的耐受性。
Reaction of Amide and Sodium Azide for the Synthesis of Acyl Azide, Urea, and Iminophosphorane
作者:Devaneyan Joseph、Sunwoo Lee
DOI:10.1021/acs.orglett.2c02429
日期:2022.8.26
in DMF at 25 °C and produce the symmetrical ureas in THF/H2O at 80 °C via the sequential reaction of acyl substitution and Curtius rearrangement. All acyl azides were also obtained from the secondary amides via sequential reaction of p-toluenesulfonyl chloride and NaN3. In addition, keto-stabilized iminophosphoranes were prepared from a one-pot reaction of amides, NaN3, and phosphines.
酰胺与 NaN 3在 25 °C 下在 DMF 中反应生成酰基叠氮化物,并在 80 °C 下通过酰基取代和 Curtius 重排的顺序反应在 THF/H 2 O 中生成对称脲。所有的酰基叠氮化物也是由仲酰胺通过对甲苯磺酰氯和NaN 3 的顺序反应得到的。此外,由酰胺、NaN 3和膦的一锅法反应制备了酮基稳定的亚氨基正膦。
Palladium and Copper‐Catalyzed Friedel–Crafts Acylation with Activated Amides
作者:Haeun Park、Sunwoo Lee
DOI:10.1002/adsc.202300376
日期:2023.9.19
The Friedel-Craftsacylation reaction between activated amides and arenes was carried out by employing [Pd(cinnamyl)Cl]2 and Cu(OTf)2 as catalysts. A range of N-phenyl-N-tosylbenzamides, which were substituted at the phenyl ring of the benzamide moiety, underwent reaction with various arenes, such as mesitylene, toluene, anisole, 4-tert-butylbenzene, o-xylene, m-xylene, and p-xylene, affording the