Application of a reusable Co-based nanocatalyst in alcohol dehydrogenative coupling strategy: Synthesis of quinoxaline and imine scaffolds
作者:Dibyajyoti Panja、Bhaskar Paul、Bhuvaneshwari Balasubramaniam、Raju K. Gupta、Sabuj Kundu
DOI:10.1016/j.catcom.2020.105927
日期:2020.4
efficient synthesis of imines and quinoxaline motifs is reported. Co(OAc)2-Phen/Carbon-800 (Co-phen/C-800) showed the superior reactivity compared to other materials prepared at different temperature, in the synthesis of quinoxalines by the coupling between diamines and diols. Moreover, applying the transfer hydrogenation and acceptorlessdehydrogenative coupling strategy, imines and quinoxaline derivatives
during the formation of iminesfrom aldehydes 1 and amines 2, is employed to promote the one-pot Mannich reaction of trimethylsilyloxyfuran 3a without addition of extra solvent or catalyst. This clean and quick reaction allows the obtention of a series of 5-substituted γ-butenolides 4 with good yields and modest diastereomeric ratio. A large panel of substituents is tolerated ranging fromaliphatic chains
Beyond Bioisosteres: Divergent Synthesis of Azabicyclohexanes and Cyclobutenyl Amines from Bicyclobutanes**
作者:Kushal Dhake、Kyla J. Woelk、Joseph Becica、Andy Un、Sarah E. Jenny、David C. Leitch
DOI:10.1002/anie.202204719
日期:2022.7.4
By exploiting the divergent reactivity of bicyclobutanes undergoing addition to imines, highly-functionalized and stereochemically-defined azabicyclohexanes and cyclobutenyl amines are easily accessible. These modular syntheses provide new and selective methods to prepare Csp3-rich scaffolds with potential beyond bioisosteric replacements in medicinal chemistry.
通过利用双环丁烷与亚胺加成的不同反应性,可以很容易地获得高度官能化和立体化学定义的氮杂双环己烷和环丁烯胺。这些模块化合成提供了新的和选择性的方法来制备富含 C sp 3的支架,在药物化学中具有超越生物等排替代物的潜力。