Photoinduced Oxidative Alkoxycarbonylation of Alkenes with Alkyl Formates
作者:Wan-Ying Tang、Ling Chen、Ming Zheng、Le-Wu Zhan、Jing Hou、Bin-Dong Li
DOI:10.1021/acs.orglett.1c01096
日期:2021.5.21
A photoinducedoxidative alkoxycarbonylation of alkenes initiated by intermolecular addition of alkoxycarbonyl radicals has been demonstrated. Employing alkyl formates as alkoxycarbonyl radical sources, a range of α,β-unsaturated esters were obtained with good regioselectivity and E selectivity under ambient conditions.
The present invention provides a pentadienamide derivative represented by the formula (I):
(wherein R1 represents substituted or unsubstituted aryl or a substituted or unsubstituted aromatic heterocyclic group;
R2 represents substituted or unsubstituted aryl, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted heteroalicyclic group, or the like;
R3 represents a hydrogen atom or is combined together with R4 and the adjacent nitrogen atom thereto to form a substituted or unsubstituted heterocyclic group;
R4 represents substituted or unsubstituted aryl, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted heteroalicyclic group, or the like, or is combined together with R3 and the adjacent nitrogen atom thereto to form a substituted or unsubstituted heterocyclic group; and
R5, R6, and R7 may be the same or different, and each represents a hydrogen atom or methyl)
or a pharmaceutically acceptable salt thereof, and the like.
The present invention provides a pentadienamide derivative represented by the formula (I):
(wherein R
1
represents substituted or unsubstituted aryl or a substituted or unsubstituted aromatic heterocyclic group;
R
2
represents substituted or unsubstituted aryl, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted heteroalicyclic group, or the like;
R
3
represents a hydrogen atom or is combined together with R
4
and the adjacent nitrogen atom thereto to form a substituted or unsubstituted heterocyclic group;
R
4
represents substituted or unsubstituted aryl, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted heteroalicyclic group, or the like, or is combined together with R
3
and the adjacent nitrogen atom thereto to form a substituted or unsubstituted heterocyclic group; and
R
5
, R
6
, and R
7
may be the same or different, and each represents a hydrogen atom or methyl)
or a pharmaceutically acceptable salt thereof, and the like.
Controlled mono- and double-Heck reaction catalyzed by a dicarbene dipalladium complex
作者:Yunfei Li、Gang Liu、Changsheng Cao、Shuzhan Wang、Yuling Li、Guangsheng Pang、Yanhui Shi
DOI:10.1016/j.tet.2013.05.030
日期:2013.7
phosphine-free mono- and double-Heck reaction of terminal olefins with electron-deficient and electron-rich aryl halides (iodides and bromides) is described. These reactions are catalyzed by the dicarbenedipalladiumcomplex 1 by controlling the stoichiometry of the aryl halide and the olefine, the loading of the palladium catalyst, as well as using different base, and with or without additive. The procedure
Visible-light-driven regioselective carbocarboxylation of 1,3-dienes with organic halides and CO<sub>2</sub>
作者:Chunlin Zhou、Xinchao Wang、Lei Yang、Lei Fu、Gang Li
DOI:10.1039/d2gc01256a
日期:——
value-added fine chemicals is an attractive synthesis strategy. Herein, we report an unprecedented visible-light-driven regioselective carbocarboxylation of 1,3-dienes with CO2 using aryl and alkyl halides under mild conditions with low-cost potassium formate (HCOOK) to produce carbon dioxide radical anions as the potent reducing agent for the challenging organic halide reduction. Highly 3,4-regioselective
利用光将二氧化碳 (CO 2 ) 转化为增值精细化学品是一种有吸引力的合成策略。在此,我们报道了一种前所未有的可见光驱动的 1,3-二烯与 CO 2的区域选择性碳羧化反应。在温和条件下使用芳基卤化物和烷基卤化物以及低成本甲酸钾 (HCOOK) 来产生二氧化碳自由基阴离子,作为具有挑战性的有机卤化物还原的有效还原剂。用 1,1-二芳基取代的 1,3-二烯实现了高度的 3,4-区域选择性碳羧化,而用受阻较小的单芳基取代的 1,3-二烯获得了主要的 1,4-碳羧化产物。该协议提供了一种从容易获得的 1,3-二烯和具有 CO 2的有机卤化物中生产复杂 β、γ-不饱和羧酸的快速方法。