Intramolecular anionic cycloaddition of 1-(3-phenyl-2-propenyl)-4-piperidinecarbonitrile. Synthesis of the 2,4a-ethanobenz[g]isoquinolin-5(1H)-one ring system
Organo tin nucleophiles IV. Palladium catalyzed conjugate reduction with tin hydride
作者:Ehud Keinan、Pierre A Gleize
DOI:10.1016/s0040-4039(00)86866-5
日期:——
Highly chemoselective conjugatereduction of α,β-unsaturated carbonyl compounds is now possible by using tributyl tin hydride with Pd(PØ3)4; an optimization study puts forth the importance of added radical scavenger and proton source in these reductions.
An Efficient Pd@Pro-GO heterogeneous catalyst was developed that can promote the α, β-dehydrogenation of saturated aldehyde and ketones in the yield of 73% − 92% at mild conditions without extra oxidants and additives. Pd@Pro-GO heterogeneous catalyst was synthesized via two steps: firstly, the Pro-GO was obtained by the esterification reaction between graphene oxide (GO) and N-(tert-Butoxycarbonyl)-l-proline
开发了一种高效的 Pd@Pro-GO 非均相催化剂,该催化剂可以在温和条件下促进饱和醛和酮的α、β-脱氢,收率可达 73% - 92%,无需额外的氧化剂和添加剂。Pd@Pro-GO非均相催化剂通过两步合成:首先,通过氧化石墨烯(GO)与N-(叔丁氧基羰基)-l-脯氨酸(Boc-Pro-OH)的酯化反应得到Pro-GO。, 然后删除保护组tert-丁氧羰基(Boc),它赋予脯氨酸功能化的GO具有路易斯酸位点(COOH)和布朗斯台德碱基位点(NH),此外,脯氨酸的吡咯烷还可以与醛形成亚胺以激活这些底物;其次,将钯分散在脯氨酸功能化的 GO (Pro-GO) 上,得到非均相催化剂 Pd@Pro-GO。机理研究表明,Pd@ Pro - GO催化的饱和醛和酮的α、β-脱氢反应是通过改进的多相催化Saegusa氧化反应实现的。基于上述特性,Pd@Pro-GO将广泛应用于过渡金属催化领域。
Intramolecular anionic cycloaddition of 1-(3-phenyl-2-propenyl)-4-piperidinecarbonitrile. Synthesis of the 2,4a-ethanobenz[g]isoquinolin-5(1H)-one ring system
作者:Robert A. Farr、Joseph E. Dolfini、Albert A. Carr