Stereodivergent Alkyne Hydrofluorination Using Protic Tetrafluoroborates as Tunable Reagents
作者:Rui Guo、Xiaotian Qi、Hengye Xiang、Paul Geaneotes、Ruihan Wang、Peng Liu、Yi‐Ming Wang
DOI:10.1002/anie.202006278
日期:2020.9.14
available precursors remains a synthetic challenge. The metal‐free hydrofluorination of alkynes constitutes an attractive though elusive strategy for their preparation. Introduced here is an inexpensive and easily handled reagent that enables the development of simple and scalable protocols for the regioselective hydrofluorination of alkynes to access both the E and Z isomers of vinyl fluorides. These
Mild and Phosphine-Free Iron-Catalyzed Cross-Coupling of Nonactivated Secondary Alkyl Halides with Alkynyl Grignard Reagents
作者:Chi Wai Cheung、Peng Ren、Xile Hu
DOI:10.1021/ol501087m
日期:2014.5.2
cross-coupling of nonactivated secondary alkylbromides and iodides with alkynyl Grignardreagents at room temperature has been developed. A wide range of secondary alkyl halides and terminal alkynes are tolerated to afford the substituted alkynes in good yields. A slight modification of the reaction protocol also allows for cross-coupling with a variety of primary alkyl halides.
Presented in this paper is photoinduced hydroxylation of organic halides, providing a mild access to a range of functionalized phenols and aliphatic alcohols. These reactions generally proceed under mild reaction conditions with no need for a photocatalyst or a strong base and show a wide substrate scope as well as excellent functional group tolerance. This work highlights the unique role of NaI that
Design and reactivity of organic functional groups: the highly crystalline 2-alkoxy N,N′-diphenyl-1,3,2-diazaphospholanes and their facile conversion into alkyl halides
作者:Stephen Hanessian、Yves Leblanc、Pierre Lavallée
DOI:10.1016/s0040-4039(00)85615-4
日期:1982.1
Functionalization of alcohols as 2-alkoxy N,N′-diphenyl-1,3,2-diazaphospholanes affords highly crystalline derivatives useful for characterization purposes. These tervalent phosphorus derivatives undergo facile and mild conversion into the corresponding alkyl halides with inversion of configuration.
Nickela‐electrocatalyzed Mild C−H Alkylations at Room Temperature
作者:Ramesh C. Samanta、Julia Struwe、Lutz Ackermann
DOI:10.1002/anie.202004958
日期:2020.8.10
nickel catalysis commonly requires high reaction temperatures and strong bases, translating into limited substrate scope. Herein, nickel‐catalyzed C−H alkylations of unactivated 8‐aminoquinoline amides have been realized under exceedingly mild conditions, namely at room temperature, with a mild base and a user‐friendly electrochemical setup. This electrocatalyzed C−H alkylation displays high functional