Design of a Bisamidinium Claisen Rearrangement Catalyst for Monodentate Substrates
摘要:
A bisamidinium catalyst has been designed for the Claisen rearrangement. The primary design feature is a dual hydrogen bonding array that can coordinate a singular oxygen atom of the substrate. The ability to function as a dual hydrogen donor is key as the bisamidinium accelerates the Claisen rearrangement to a greater extent than Bronsted acids with lower pK(a) values.
Tandem Dearomatization/Enantioselective Allylic Alkylation of Pyridines
作者:Steffen Greßies、Lars Süße、Tyler Casselman、Brian M. Stoltz
DOI:10.1021/jacs.3c02470
日期:2023.6.7
of substituted pyridines leading to N-protected tetrahydropyridines with outstanding enantioselectivity (up to 97% ee). An iridium(I)-catalyzed dearomative 1,2-hydrosilylation of pyridines enables the use of N-silyl enamines as a new type of nucleophile in a subsequent palladium-catalyzed asymmetric allylicalkylation. This telescoped process overcomes the intrinsic nucleophilic selectivity of pyridines
Bandgar; Sadavarte; Uppalla, Journal of Chemical Research - Part S, 2000, # 9, p. 450 - 451
作者:Bandgar、Sadavarte、Uppalla
DOI:——
日期:——
Energetic and rate effects of the trifluoromethyl group at C-2 and C-4 on the aliphatic Claisen rearrangement
作者:Joseph J. Gajewski、Kyle R. Gee、J. Jurayj
DOI:10.1021/jo00293a027
日期:1990.3
Design of a Bisamidinium Claisen Rearrangement Catalyst for Monodentate Substrates
作者:Venkatachalam R. Annamalai、Elizabeth C. Linton、Marisa C. Kozlowski
DOI:10.1021/ol8026945
日期:2009.2.5
A bisamidinium catalyst has been designed for the Claisen rearrangement. The primary design feature is a dual hydrogen bonding array that can coordinate a singular oxygen atom of the substrate. The ability to function as a dual hydrogen donor is key as the bisamidinium accelerates the Claisen rearrangement to a greater extent than Bronsted acids with lower pK(a) values.