Highly chemo- and stereoselective Fe-catalyzed alkenylation of organomanganese reagents
作者:Gérard Cahiez、Sophie Marquais
DOI:10.1016/0040-4039(96)00116-5
日期:1996.3
Organomanganese chlorides react with alkenyl iodides, bromides and chlorides in the presence of 3% Fe(acac)3. The reaction takes place under very mild conditions (THF-NMP, rt, 1h) to afford the substituted olefin in excellent yields with a high stereo- and chemoselectivity. Thus an unprotected keto alkenyl chloride selectively gives the corresponding keto olefin. From a preparative point of view, this
Iron-Catalyzed Contrasteric Functionalization of Allenic C(sp<sup>2</sup>)–H Bonds: Synthesis of α-Aminoalkyl 1,1-Disubstituted Allenes
作者:Yidong Wang、Sarah G. Scrivener、Xiao-Dong Zuo、Ruihan Wang、Philip N. Palermo、Ethan Murphy、Austin C. Durham、Yi-Ming Wang
DOI:10.1021/jacs.1c07512
日期:2021.9.22
An iron-catalyzed C–H functionalization of simple monosubstituted allenes is reported. An efficient protocol for this process was made possible by the use of a newly developed electron-rich and sterically hindered cationic cyclopentadienyliron dicarbonyl complex as the catalyst and N-sulfonyl hemiaminal ether reagents as precursors to iminium ion electrophiles. Under optimized conditions, the use of
Cobalt-catalyzed alkenylation of organomagnesium reagents
作者:Gérard Cahiez、Hovsep Avedissian
DOI:10.1016/s0040-4039(98)01266-0
日期:1998.8
Alkenyl iodides, bromides and chlorides react with organomagnesium reagents in THF, in the presence of Co(acac)2 and NMP (9 to 4 equiv.), to give the cross-coupling products in good yields. The reaction is chemoselective (aryl or alkyl bromides, esters and ketones) and stereoselective (≥99.5%).
Preparation of 1,3-diols by metalation-hydroboration of alkynes
作者:A. Medlik-Balan、J. Klein
DOI:10.1016/0040-4020(80)80018-4
日期:1980.1
Metalation of a series of 1- and 2-alkynes with subsequent treatment with diborane and oxidation gave 1,3-diols exclusively. Deuteroboration of the lithiated acetylenes established the occurrence of a displacement of one of the B atoms by deuterium in gem-diboronated compounds. Hydroboration of several acetylenes and acetylides was also studied.