Mononuclear Nonheme Iron(III)‐Iodosylarene and High‐Valent Iron‐Oxo Complexes in Olefin Epoxidation Reactions
作者:Bin Wang、Yong‐Min Lee、Mi Sook Seo、Wonwoo Nam
DOI:10.1002/anie.201505796
日期:2015.9.28
High‐spin iron(III)‐iodosylarene complexes are highly reactive in the epoxidation of olefins, in which epoxides are formed as the major products with high stereospecificity and enantioselectivity. The reactivity of the iron(III)‐iodosylarene intermediates is much greater than that of the corresponding iron(IV)‐oxo complex in these reactions. The iron(III)‐iodosylarene species—not high‐valent iron(IV)‐oxo
Asymmetric Hydrogenation of Ketones and Enones with Chiral Lewis Base Derived Frustrated Lewis Pairs
作者:Bochao Gao、Xiangqing Feng、Wei Meng、Haifeng Du
DOI:10.1002/anie.201914568
日期:2020.3.9
The concept of frustratedLewispairs (FLPs) has been widely applied in various research areas, and metal-free hydrogenation undoubtedly belongs to the most significant and successful ones. In the past decade, great efforts have been devoted to the synthesis of chiral boron Lewis acids. In a sharp contrast, chiral Lewisbase derived FLPs have rarely been disclosed for the asymmetric hydrogenation.
Formal [4 + 1] annulation of fluorinated sulfonium salt with cyclic unsaturated imines to access CF<sub>3</sub>-substituted pyrroles
作者:Tao Chen、Aoning Wang、Linxue Zhang、Chenlong Wei、Juhui Huang、Xiang Liu、Zhenqian Fu
DOI:10.1039/d1ob00218j
日期:——
Formal [4 + 1] annulation of easily available fluorinated sulfonium salt with cyclic unsaturated imines has been successfully developed. A structurally diverse set of CF3-substituted dihydropyrroles was efficiently constructed in acceptable to excellent yields with excellent diastereoselectivities. The resulting CF3-containing dihydropyrroles from this transition metal-free strategy could be easily
A facile and efficient reaction of α,β-unsaturated ketones and 3-amino-1-phenyl-1H-pyrazol-5(4H)-one in aqueous and acetonitrile medium
作者:Shuangshuang Xu、Zhansheng Wang、Xiuling Li、Liangce Rong、Shu-Jiang Tu
DOI:10.1016/j.tet.2016.07.073
日期:2016.9
A facile and efficient synthesis of pyrazolo[3,4-b]pyridines, indeno[1,2-b]pyrazolo[4,3-e]pyridine and benzo[h]pyrazolo[3,4-b]quinoline derivatives from the reaction of α,β-unsaturated ketone and 3-amino-1-phenyl-1H-pyrazol-5(4H)-one under mild conditions was reported. This reaction could be operated in aqueous and acetonitrile medium. The other advantages of this reaction were simple operation, mild
一种高效合成吡唑并[3,4- b ]吡啶,茚并[1,2- b ]吡唑并[4,3- e ]吡啶和苯并[ h ]吡唑并[3,4- b ]喹啉衍生物。报道了α,β-不饱和酮与3-氨基-1-苯基-1 H-吡唑-5(4 H)-one在温和条件下的反应。该反应可以在含水和乙腈介质中进行。该反应的其他优点是操作简单,反应条件温和,产率高和底物范围广。此外,3-amino-1-phenyl-1 H -pyrazol-5(4 H-一是用于合成这些杂环化合物的有效试剂。从实验事实来看,他的催化剂p -TSA·H 2 O和水都在该合成中起关键作用。
Enantioselective phospha-Michael reaction of diethyl phosphonate with exocyclic α,β-unsaturated benzocyclic ketones catalyzed by a dinuclear zinc−AzePhenol catalyst
作者:Na Shao、Yong-Yang Luo、Hui-Jie Lu、Yuan-Zhao Hua、Min-Can Wang
DOI:10.1016/j.tet.2018.03.016
日期:2018.4
The dinuclear zinc complexes as high performance catalysts were used to catalyze phospha-Michael reaction of exocyclic α,β-unsaturated benzocyclic ketones under mild conditions, and the desired products possessing 1-indanones or 1-tetralones skeleton were obtained with excellent enantioselectivities of up to 99%/99% ee and yields of up to 99%. The absolute stereochemistry of the major products catalyzed