Iron-Catalyzed Regio- and Stereoselective Hydrosilylation of 1,3-Enynes To Access 1,3-Dienylsilanes
作者:Zhihao Guo、Huanan Wen、Guixia Liu、Zheng Huang
DOI:10.1021/acs.orglett.1c00670
日期:2021.3.19
A regio- and stereoselectivehydrosilylation of 1,3-enynes with primary and secondary silanes to access 1,3-dienylsilanes is accomplished by employing an iron precatalyst bearing iminopyridine-oxazoline (IPO) ligand. The hydrosilylation proceeds via syn-addition of a Si–H bond to the alkyne group of 1,3-enynes, incorporating the silyl group at the site proximal to the alkene. The reaction features
[reaction: see text] A combination of CoCl(2) and 1,6-bis(diphenylphosphino)hexane catalyzes a novel three-componentcoupling reaction of alkyl bromides, 1,3-dienes, and silylmethylmagnesium chloride, yielding homoallylsilanes in good to excellent yields. The reaction involves a radical species from alkyl halides.
Regio-, Site-, and Stereoselective Three-Component Aminofluorination of 1,3-Dienes via Cooperative Silver Salt and Copper Catalysis
作者:Yang Li、Yujiao Dong、Xin Wang、Guangfu Li、Huiqing Xue、Wanyang Xin、Qian Zhang、Wei Guan、Junkai Fu
DOI:10.1021/acscatal.2c06025
日期:2023.2.17
broad substrate scope for both alkyl- and aryl-1,3-dienes with diverse functionalities, furnishing the allylic fluorides bearing homoallylic tertiary alkylamine moieties with high regio-, site-, and stereoselectivities. Moreover, the reactions of E/Z-mixed 1,3-dienes are allowed for the preparation of single E-products. Further mechanistic studies reveal a reaction sequence involving aminium radical cation
1,3-二烯的分子间氟双官能化提供了获得高度官能化的烯丙基氟化物的直接途径,但存在选择性低和底物范围有限的问题。在此,我们报告了银盐和铜协同催化平台的开发,该平台可实现 1,3-二烯与N-溴二烷基胺和 AgF 的分子间三组分 1,2-氨基氟化。该协议展示了具有不同功能的烷基-和芳基-1,3-二烯的广泛底物范围,为带有高区域选择性、位点选择性和立体选择性的烯丙基氟化物提供了同烯丙基叔烷基胺基团。此外, E / Z -混合 1,3-二烯的反应可用于制备单一E-产品。进一步的机理研究揭示了一个涉及氨基自由基阳离子 (ARC) 生成、氮丙啶鎓形成和亲核氟化的反应序列,并强调了协同银和铜配合物的关键作用,使氨基氟化反应能够以良好的效率和高选择性进行。
Novel Endoperoxide Antimalarials: Synthesis, Heme Binding, and Antimalarial Activity
作者:Dennis K. Taylor、Thomas D. Avery、Ben W. Greatrex、Edward R. T. Tiekink、Ian G. Macreadie、Peter I. Macreadie、Adam D. Humphries、Martha Kalkanidis、Emma N. Fox、Nectarios Klonis、Leann Tilley
DOI:10.1021/jm0305319
日期:2004.3.1
We report the synthesis of a series of novel epoxy endoperoxide compounds that can be prepared in high yields in one to three steps from simple starting materials. Some of these compounds inhibit the growth of Plasmodium falciparum in vitro. Structure-activity studies indicate that an endoperoxide ring bisubstituted with saturated cyclic moieties is the pharmacophore. To study the molecular basis of