铜(I)催化剂可通过使用合适的有机碱将二氧化碳插入炔烃的C H键中,利用该有机碱在热力学上可实现对羧酸盐的氢化以及碱的再生。在催化氯化铜(I)/ 4,7-二苯基-1,10-菲咯啉,聚合物结合的三苯基膦和2,2,6,6-四甲基哌啶为碱的情况下,末端炔烃在15 bar CO下进行羧化反应2,室温。过滤后,可以在铑/钼催化剂下将炔羧酸铵氢化为伯醇和水,以再生胺碱。这证明了无盐整体工艺的可行性,在该工艺中,二氧化碳可充当CH功能中C1的基石。
Oxidant- and additive-free simple synthesis of 1,1,2-triiodostyrenes by one-pot decaroboxylative iodination of propiolic acids
作者:Subhankar Ghosh、Rajat Ghosh、Shital K. Chattopadhyay
DOI:10.1016/j.tetlet.2020.152378
日期:2020.10
A metal- and oxidant-free facile synthesis of a range of 1,1,2-triiodostryrene derivatives has been developed which utilizes a simple decarboxylative triiodination of propiolicacids using molecular iodine and sodium acetate in a one-pot manner. Electron-withdrawing or donating substituents in the aryl rings display marginal influence on the course of the reaction. Mechanistic investigation reveals
Synthesis of 2-Amino-6-phenyl-4<i>H</i>-pyran-4-ones
作者:Joel Morris、Donn G. Wishka
DOI:10.1055/s-1994-25402
日期:——
The treatment of a series of phenylacetylenic ß-keto amides with methanesulfonic acid produces a high yielding intramolecular cyclization to the corresponding 2-amino-6-phenyl-4H-pyran-4-ones.
cobalt(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, and functional groups tolerance. Such a carboamination reaction was applied to modified phenolsfrom the corresponding phenols under mild conditions.
De Novo Construction of Substituted Terephthalates via Phosphine Catalyzed Domino Benzannulation Reactions
作者:Dan Wang、Junhui Lin、Yannan Zhu、You Huang
DOI:10.1002/adsc.202001513
日期:2021.3.29
The robustness of phosphine catalysis enabling the domino benzannulationreactions of allenoates with enamines is described. A broad array of substituted terephthalates were delivered under simple and practical reaction conditions. Furthermore, the reaction could be carried out on a gram scale with higher yield, and various conversions of the terephthalate products demonstrate the versatility of this
Transition Metal-Free <i>Trans</i> Hydroboration of Alkynoic Acid Derivatives: Experimental and Theoretical Studies
作者:Russell Fritzemeier、Ashley Gates、Xueying Guo、Zhenyang Lin、Webster L. Santos
DOI:10.1021/acs.joc.8b01493
日期:2018.9.7
(E)-β-boryl acrylamides in good to excellent yields. The reaction is tolerant of a variety of functional groups and allows efficient access to novel oxaboroles as well as a pargyline derivative (MAO inhibitor). Theoretical calculations suggest an internal hydride generates a phosphonium allenoxyborane followed by the formation of a key phosphonocyclobutene intermediate that collapses in a stereoselective