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• W2887606625 abstract "Although transition-metal-catalyzed B-H bond insertion of carbenes into stable borane adducts has emerged as a promising method for organoborane synthesis, all the diazo compounds used to date as carbene precursors have had an electron-withdrawing group to stabilize them. Herein, we report a protocol for rhodium-catalyzed B-H bond insertion reactions of unstabilized diazo compounds generated in situ from tosylhydrazones. In addition, by using chiral dirhodium catalysts, we also achieved an asymmetric version of the reaction with good to excellent enantioselectivities (up to 98:2 e.r.). This is the first enantioselective heteroatom-hydrogen bond insertion reaction to use unstabilized diazo compounds as carbene precursors. The protocol exhibited good functional group tolerance and could be carried out on a gram scale. It also enabled one-pot transformation of a carbonyl group to a boryl group enantioselectively. The B-H bond insertion products could be easily transformed into chiral alcohols and other widely used organoboron reagents with enantiomeric fidelity." @default.
• W2887606625 created "2018-08-22" @default.
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• W2887606625 date "2018-08-13" @default.
• W2887606625 modified "2023-10-14" @default.
• W2887606625 title "Rhodium-Catalyzed B–H Bond Insertion Reactions of Unstabilized Diazo Compounds Generated <i>in Situ</i> from Tosylhydrazones" @default.
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• W2887606625 doi "https://doi.org/10.1021/jacs.8b05946" @default.
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• W2887606625 hasPublicationYear "2018" @default.
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