提出了使用一氧化碳作为直接还原剂将末端环氧化物和内部环氧化物脱氧成相应的烯烃。该反应由羰基钳-铱(I)络合物与路易斯酸助催化剂结合均匀催化,实现环氧化物底物的预活化,以及从γ-2-铱丁内酯中消除CO 2中间的。特别是末端烷基环氧化物在CO气氛下、苯或甲苯中、80-120℃下反应顺利,并且不会明显异构化为内烯烃。详细的研究揭示了环氧化物C−O键活化机制中底物依赖性变化,该变化发生在保留构型的氧化加成和导致构型反转的S N 2 反应之间。
The first Corey-Chaykovsky epoxidation and cyclopropanation using trimethyl sulfonium iodide/trimethyl sulfoxonium iodide and KOH as base in the recyclable ionic liquid, (bmim)PF6 are described. (C) 2003 Elsevier Science Ltd. All rights reserved.
An improved preparation of epoxides from carbonyl compounds by using diiodomethane/methyllithium: synthetic applications
作者:José M Concellón、Humildad Cuervo、Ramón Fernández-Fano
DOI:10.1016/s0040-4020(01)00890-0
日期:2001.10
Synthesis of epoxides starting from different carbonyl compounds is easily carried out by using a diiodomethane and methyl-lithium at 0 degreesC and a short reaction time. Starting from alpha -aminoaldehydes the reaction affords amino epoxides, with high diastereoselectivity. The products were transformed into 1,3-diaminoalkan-2-ols by treatment with different amines. (C) 2001 Elsevier Science Ltd. All rights reserved.
BOUDA H.; BORREDON M. E.; DELMAS M.; GASET A., SYNTH. COMMUN., 17,(1987) N 5, 503-513
作者:BOUDA H.、 BORREDON M. E.、 DELMAS M.、 GASET A.
DOI:——
日期:——
Deoxygenation of Epoxides with Carbon Monoxide
作者:Theo Maulbetsch、Eva Jürgens、Doris Kunz
DOI:10.1002/chem.202002651
日期:2020.8.17
deoxygenation of terminal and internal epoxides to the respective olefins is presented. This reaction is homogeneously catalyzed by a carbonyl pincer‐iridium(I) complex in combination with a Lewis acid co‐catalyst to achieve a pre‐activation of the epoxide substrate, as well as the elimination of CO2 from a γ‐2‐iridabutyrolactone intermediate. Especially terminal alkyl epoxides react smoothly and without significant
提出了使用一氧化碳作为直接还原剂将末端环氧化物和内部环氧化物脱氧成相应的烯烃。该反应由羰基钳-铱(I)络合物与路易斯酸助催化剂结合均匀催化,实现环氧化物底物的预活化,以及从γ-2-铱丁内酯中消除CO 2中间的。特别是末端烷基环氧化物在CO气氛下、苯或甲苯中、80-120℃下反应顺利,并且不会明显异构化为内烯烃。详细的研究揭示了环氧化物C−O键活化机制中底物依赖性变化,该变化发生在保留构型的氧化加成和导致构型反转的S N 2 反应之间。