NaOH-Promoted Chemoselective Cascade Cyclization of Cyclopropyl Esters with Unsaturated Imines: Access to Bioactive Cyclopenta[c]pyridine Derivatives
作者:Dingwu Pan、Chengli Mou、Ningning Zan、Ya Lv、Bao-An Song、Yonggui Robin Chi、Zhichao Jin
DOI:10.1021/acs.orglett.9b02088
日期:2019.9.6
A chemoselective cascade cycloaddition reaction is developed for green and efficient access to cyclopenta[c]pyridine derivatives. Simple and inexpensive NaOH is used as the sole catalyst for this process. The δ-carbon of cyclopropyl ester is activated as a nucleophilic carbon to initiate highly chemoselective cascade reactions. Cyclopenta[c]pyridines bearing various substituents are afforded in excellent
Abstract Thirty semicarbazone and thiosemicarbazone derivatives (2a–w and 4a–g) from chalcones containing furan and thiophene ring were designed and synthesized. They were characterized by IR, 1H NMR, 13C NMR and HRMS. The crystal structure of compound 2r was characterized by single crystal X-ray diffraction. It crystallizes in the monoclinic system with space group P21/c. The insecticidal activity
摘要 设计并合成了来自含有呋喃和噻吩环的查耳酮的30 种缩氨基脲和缩氨基硫脲衍生物(2a - w和4a - g)。它们通过 IR、1 H NMR、13 C NMR 和 HRMS进行表征。化合物2r的晶体结构通过单晶X射线衍射表征。它在空间群为P 2 1 / c的单斜晶系中结晶。合成的化合物对白斑病和菜青虫的杀虫活性进行了筛选使用β-氯氰菊酯作为比较标准。结果表明,它们中的大多数具有显着的杀虫活性。其中,化合物2e-g对L表现出比 β-氯氰菊酯更好的活性。分离和P。油菜。化合物2p还具有比 β-氯氰菊酯更好的抗P活性。油菜。这些化合物的杀虫活性是首次报道。