羰基-烯烃复分解 (COM) 反应是从羰基前体形成新的碳-碳双键的一种有吸引力的方法。原则上,该反应可以通过用布朗斯台德酸催化剂活化羰基来促进;然而,由于在酸性条件下发生不希望的副反应,它通常很复杂。因此,只有极少数的布朗斯台德酸催化 COM 反应的例子,所有这些都需要专门设计的装置。在此,我们报告了一种新的实用均相布朗斯台德酸催化方案,该方案使用硝基甲烷(一种容易获得的溶剂)来促进分子内闭环 COM 反应。
Carbonyl–Olefin Metathesis Catalyzed by Molecular Iodine
作者:Uyen P. N. Tran、Giulia Oss、Martin Breugst、Eric Detmar、Domenic P. Pace、Kevin Liyanto、Thanh V. Nguyen
DOI:10.1021/acscatal.8b03769
日期:2019.2.1
The carbonyl–olefin metathesisreaction could facilitate rapid functional group interconversion and allow construction of complicated organic structures. Herein, we demonstrate that elemental iodine, a very simple catalyst, can efficiently promote this chemical transformation under mild reaction conditions. Our mechanistic studies revealed intriguing aspects of the activation mode via molecular iodine
organic synthesis due to its versatility in functional group interconversion chemistry. Recent developments in the field have identified a number of transition-metal and organic Lewisacids as effectivecatalysts for this reaction. Herein, we report the use of simple organic compounds such as N-iodosuccinimide or iodine monochloride to catalyze the carbonyl–olefin metathesis process under mild reaction
作者:Tuong Anh To、Chao Pei、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1002/anie.202117366
日期:2022.3.21
H-bonding network: Hexafluoroisopropanol (HFIP) can act as a hydrogen-bond donor to enhance the catalytic efficiency of simple Brønsted acid catalysts in carbonyl-olefin metathesis reactions by stabilization of all transition states and intermediates along the reaction pathway.
作者:Lina Ma、Wenjuan Li、Hui Xi、Xiaohui Bai、Enlu Ma、Xiaoyu Yan、Zhiping Li
DOI:10.1002/anie.201604349
日期:2016.8.22
carbonyl–olefin metathesis is an ongoing challenge in organic synthesis. Reported herein is an FeCl3‐catalyzedring‐closing carbonyl–olefin metathesis. The protocol allows access to a range of carbo‐/heterocyclic alkenes with good efficiency and excellent trans diastereoselectivity. The methodology presents one of the rare examples of catalytic ring‐closing carbonyl–olefin metathesis. This process is
The carbonyl–olefin metathesis (COM) reaction is an attractive approach for the formation of a new carbon–carbon double bond from a carbonyl precursor. In principle, this reaction can be promoted by the activation of the carbonyl group with a Brønsted acid catalyst; however, it is often complicated as a result of unwanted side reactions under acidic conditions. Thus, there have been only a very few
羰基-烯烃复分解 (COM) 反应是从羰基前体形成新的碳-碳双键的一种有吸引力的方法。原则上,该反应可以通过用布朗斯台德酸催化剂活化羰基来促进;然而,由于在酸性条件下发生不希望的副反应,它通常很复杂。因此,只有极少数的布朗斯台德酸催化 COM 反应的例子,所有这些都需要专门设计的装置。在此,我们报告了一种新的实用均相布朗斯台德酸催化方案,该方案使用硝基甲烷(一种容易获得的溶剂)来促进分子内闭环 COM 反应。