A convenient synthesis of β-lactams from alkylthioimidates
摘要:
Stereoselective syntheses of trans-3,4,4-substituted-azetidin-2-ones from alkylthioimidates are described. Reduction of these compounds gave stereoselectively cis-4-alkyl-azetidin-2-ones which could be useful intermediates for preparation of biologically active B-lactams.
Three component reactions of olefins, amines, and sulfur were studied. Thioamidation of styrenes is base-controlled, and 2-phenylethanethioamides and benzothioamides were obtained selectively in the presence of two different bases. This protocol offers a simple and efficient procedure for the synthesis of thioamides.
Selective reduction of carbonyl groups in the presence of low-valent titanium reagents
作者:Wei Lin、Ming-Hua Hu、Xian Feng、Lei Fu、Cheng-Pao Cao、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1016/j.tetlet.2014.02.072
日期:2014.4
The chemoselective reduction of several structurally diverse compounds containing carbonyl groups was achieved in the presence of low-valenttitaniumreagents. This novel synthetic method provides easy access to highly selective reduction of carbonyl groups, and possesses several advantages including one-step procedure, convenient manipulation, good to excellent yields, and short reaction times.
Base‐Catalyzed Synthesis of <i>N</i>‐Aryl Thioacetamides from Multicomponent Reaction of Phenylacetylenes, Sulfur and Anilines
作者:Minh Hang Nguyen、Hai Sam Nguyen、Le Anh Nguyen、Bich Ngoc Nguyen、Hai Thuong Cao、Dinh Hung Mac、Thanh Binh Nguyen
DOI:10.1002/ejoc.202301319
日期:2024.3.11
“Rien ne se perd, rien ne se crée”: N-aryl arylthioacetamides could be formed via base-catalyzed three-component reaction of anilines, phenylacetylenes and elemental sulfur with complete atom efficiency.
“Rien ne se perd, rien ne se crée”:N-芳基芳基硫代乙酰胺可以通过苯胺、苯乙炔和元素硫的碱催化三组分反应以完全原子效率形成。
A Convenient Synthesis of Ketenimines from Thioamides with Haloiminium Salts
Ketenimines were conveniently synthesized from N-monosubstituted thioacetamides with dehydrating agents such as 2-chloro-1,3-dimethylimidazolinium chloride or 2-chloro-1-methylpyridinium iodide.
A convenient synthesis of β-lactams from alkylthioimidates
作者:Edward Grochowski、Krzysztof Pupek
DOI:10.1016/s0040-4020(01)82327-9
日期:1991.8
Stereoselective syntheses of trans-3,4,4-substituted-azetidin-2-ones from alkylthioimidates are described. Reduction of these compounds gave stereoselectively cis-4-alkyl-azetidin-2-ones which could be useful intermediates for preparation of biologically active B-lactams.