amount of InCl3 and aceticanhydride remarkably promotes the Knoevenagel condensation of a variety of aldehydes and activated methylene compounds. This catalytic system accommodates aromatic aldehydes containing a variety of electron-donating and -withdrawing groups, heteroaromatic aldehydes, conjugate aldehydes, and aliphatic aldehydes. Central to successfully driving the condensation series is the formation
Asymmetric Michael Addition of Ketones to Alkylidene Malonates and Allylidene Malonates via Enamine–Metal Lewis Acid Bifunctional Catalysis
作者:Lu Liu、Ryan Sarkisian、Zhenghu Xu、Hong Wang
DOI:10.1021/jo301070s
日期:2012.9.7
Novel enamine–metal Lewis acid bifunctional catalysts were successfully applied to the asymmetric Michaeladdition of ketones to alkylidenemalonates, offering excellent stereoselectivity (up to >99% ee and >99:1 dr). The asymmetric Michaeladdition of ketones to allylidene malonates was also achieved.
Construction of 1-pyrroline skeletons by Lewis acid-mediated conjugate addition of vinyl azides
作者:Xu Zhu、Shunsuke Chiba
DOI:10.1039/c5cc10299e
日期:——
The Lewis acid-mediated conjugate addition of vinyl azides to electron-deficient alkenes led to the efficient construction of 1-pyrroline skeletons.
Lewis酸介导的乙烯基叠氮化物与电子亏缺烯烃的共轭加成,有效地构建了1-吡咯烯骨架。
Solid-phase synthesis of arylidene and alkylidene malonates, as versatile intermediates, catalyzed using mesoporous poly-melamine–formaldehyde as a nitrogen-rich porous organic polymer (POP)
作者:Nader Ghaffari Khaligh、Hayedeh Gorjian、Hoda Fahim、Salam J. J. Titinchi
DOI:10.1007/s11164-021-04476-w
日期:2021.9
could be recovered and reused ten times, and the results showed a negligible loss of catalytic activity. Various aryl- and heteroarylidene malonates, as well as dimethyl (cyclohexylidene)malonate, were isolated in good to high yields under optimal conditions. The use of hazardous reagents and solvents were minimized in the current method, and separation of catalyst and products, as well as the recovery
Synthesis of polysubstituted 1,3-cyclohexadienes from ?-branched ?,?-alkenals and monoesters of ylidenemalonic acids
作者:A. G. Nigmatov、I. N. Kornilova、E. P. Serebryakov
DOI:10.1007/bf01433750
日期:1996.1
configurations of which were determined by means of1H NMR spectroscopy. In some cases the formation of cyclic dienes is impeded by the competing process of decarboxylation of acidic ylidenemalonates. The derivatives of 4,6-diphenyl-1,3-cyclohexadienecarboxylic acid were shown to be convenient precursors for the preparation ofmeta-terphenyls.