One-Step, Effective, and Cascade Syntheses of Highly Functionalized Cyclopentenes with High Diastereoselectivity
作者:Suman Alishetty、Hong-Pin Shih、Chien-Chung Han
DOI:10.1021/acs.orglett.8b00510
日期:2018.5.4
Tetrabutylammoniumfluoride works as an effective organocatalyst for the cycloaddition between phenacylmalononitriles and electron-deficient olefins (having substituent groups of NO2, CHO, and COR), providing a facile synthetic route to versatile multifunctionalized cyclopentenes having an allylic quaternary carbon center bearing both cyano and carboxamide groups with high yields and high diastereoselectivity
The present invention provides a production method of a sulfonylpyrrole compound useful as a pharmaceutical product, a production method of an intermediate used for the method, and a novel intermediate. The present invention relates to a method of producing sulfonylpyrrole compound (VIII), which includes reducing compound (III) and hydrolyzing the reduced product to give compound (IV), subjecting compound (IV) to a sulfonylation reaction to give compound (VI), and subjecting compound (VI) to an amination reaction.
Substrate-controlled, PBu<sub>3</sub>-catalyzed annulation of phenacylmalononitriles with allenoates enables tunable access to cyclopentenes
作者:Narendra Kumar Vaishanv、Sanoop P Chandrasekharan、Mohd Khalid Zaheer、Ruchir Kant、Kishor Mohanan
DOI:10.1039/d0cc04688d
日期:——
phenacylmalononitriles with allenoates, controlled by the γ-substitution on allenoates, offers a tunable synthesis of multifunctionalized cyclopentene carboxamides and cyclopentenols. An unprecedented formation of cyclopentene carboxamide was observed when allenic esters bearing a substitution at the γ-position were employed, while unsubstituted allenoates produced cyclopentenols. The former reaction likely involves
An Efficient, Scalable and Eco‐friendly Synthesis of 4,5‐substituted Pyrrole‐3‐Carbonitriles by Intramolecular Annulation on Pd/C and HZSM‐5
作者:Jianchao Chen、Chengtao Li、Yanan Zhou、Changshan Sun、Tiemin Sun
DOI:10.1002/cctc.201900154
日期:2019.4.4
An efficient and eco‐friendly protocol for the synthesis of diverse 4,5‐substituted 1H‐pyrrole‐3‐carbonitriles has been developed using commercially available HZSM‐5 and Pd/C as recyclable heterogeneous catalysts with more excellent yields (up to 98 %) than traditional liquids acids, and successfully applied in the practical synthesis of vonoprazan. The conspicuous features of this protocol are higher
A new strategy for the construction of functionalized 2-amino-3-cyano pyrroles has been developed. The reactions involved a copper-catalyzed azide–alkyne cycloaddtion reaction between terminal alkynes and sulfonylazides followed by generation of N-sulfonoketenimine intermediates. Interception of these reactive ketenimines by phenacylmalononitriles in the presence of copper(I) iodide and Et3N afforded
开发了一种构建功能化 2-氨基-3-氰基吡咯的新策略。该反应涉及末端炔烃和磺酰叠氮化物之间的铜催化叠氮化物-炔烃环加成反应,然后生成N-磺基烯酮亚胺中间体。在碘化铜 ( I ) 和 Et 3 N存在下,苯甲酰丙二腈拦截这些反应性烯酮亚胺提供了预期的产物。反应在环境温度下在 THF 中顺利进行,以 70-92% 的收率和优异的区域选择性得到目标化合物。典型产品结构的证据来自单晶 X 射线分析。