Copper-catalysed enantioselective intramolecular C–H insertion reactions of α-diazo-β-keto esters and α-diazo-β-keto phosphonates
摘要:
Copper-catalysed intramolecular C-H insertion reactions of alpha-diazo-beta-keto esters and alpha-diazo-beta-keto phosphonates are described, with moderate-to-good levels of enantioselectivity achieved for reactions employing the borate additive sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaBARF). Notably, the first example of asymmetric induction reported to date for intramolecular C-H insertion of an alpha-diazo-beta-keto phosphonate is also described. (C) 2013 Elsevier Ltd. All rights reserved.
Carbenoid Reactions in Rhodium(II)-Catalyzed Decomposition of Iodonium Ylides
作者:Paul Müller、Daniel Fernandez
DOI:10.1002/hlca.19950780417
日期:1995.6.28
intermediacy of metallocarbenes in decomposition reactions of iodonium ylides with [Rh2(OAc)4] was established by comparison with reactions of the corresponding diazo compounds. The sensitivity of the RhII-catalyzed intermolecular cyclopropane formation from substituted styrenes and bis(methoxycarbonyl)(phenyliodono)methanide (1a) or dimethyl diazomalonate (1b) is identical. The Hammett plot (with σ+)
Copper-catalysed enantioselective intramolecular C–H insertion reactions of α-diazo-β-keto esters and α-diazo-β-keto phosphonates
作者:Catherine N. Slattery、Anita R. Maguire
DOI:10.1016/j.tetlet.2013.03.078
日期:2013.5
Copper-catalysed intramolecular C-H insertion reactions of alpha-diazo-beta-keto esters and alpha-diazo-beta-keto phosphonates are described, with moderate-to-good levels of enantioselectivity achieved for reactions employing the borate additive sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaBARF). Notably, the first example of asymmetric induction reported to date for intramolecular C-H insertion of an alpha-diazo-beta-keto phosphonate is also described. (C) 2013 Elsevier Ltd. All rights reserved.