Transition-metal and base-free thioannulation of propynamides with sodium sulfide and dichloromethane for the selective synthesis of 1,3-thiazin-4-ones and thiazolidine-4-ones
A thioannulation of propynamides with sodium sulfide and CH2Cl2 in the absence of transition-metal and base has been established. This one-pot tandem reaction provides a facile and efficient method for the selective synthesis of 1,3-thiazide-4-ones or thiazolidine-4-ones through constructing both C–N and C–S bonds. The atom-economic reaction features mild conditions and good functional group tolerance
An efficient and facile method for the preparation of alkynamides through Et3N-catalyzed alumination of alkyl- or aryl-substituted terminal alkynes with AlMe3 and sequential nucleophilic addition of in situ generated alkynylaluminums to isocyanates is described. This method has the merits of using readily available isocyanates and monosubstituted alkynes, easy access to organoaluminums, short reaction
描述了一种通过 Et 3 N 催化用 AlMe 3对烷基或芳基取代的末端炔烃进行铝化以及将原位生成的炔基铝连续亲核加成到异氰酸酯上来制备炔酰胺的有效且简便的方法。该方法具有使用易得的异氰酸酯和单取代炔烃、有机铝易获得、反应时间短、效率高等优点。所需炔酰胺的克级合成及其在 α-亚甲基-β-内酰胺形成中的应用证明了该方法的合成效用。
Co(II)/Ag(I) Synergistically Catalyzed Monoinsertion Reaction of Isocyanide to Terminal Alkynes with H<sub>2</sub>O: Synthesis of Alkynamide Derivatives
作者:Rong Zhang、Zheng-Yang Gu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.8b02516
日期:2018.9.7
with terminal alkyne and water to afford alkynamide derivatives is reported. The insertion of monoisocyanide into the C–H bond of terminal alkynes is an efficient, straightforward, atom-economical route to alkynamides, which are useful synthons in organic synthesis. This synergistic process achieves the cleavage of a C–H bond and the construction of new C–C and C═O bonds under mild conditions through the
Access to 3‐(2‐Oxoalkyl)‐azaspiro[4.5]trienones
<i>via</i>
Acid‐Triggered Oxidative Cascade Reaction through Alkenyl Peroxide Radical Intermediate
作者:Chang‐Sheng Wang、Thierry Roisnel、Pierre H. Dixneuf、Jean‐François Soulé
DOI:10.1002/adsc.201801203
日期:2019.2
Azaspiro[4.5]trienones bearingketone side chains at the 3‐position are prepared from N‐alkyl‐arylpropiolamides and ketones via oxidative 1,2‐difunctionalization of alkynes. The cascade sequence starts with the generation of alkenyl peroxide intermediates, which are obtained by addition of tert‐butyl hydroperoxide to ketones in presence of a catalytic amount of a strong acid. Then, the ketone radical adds to