Free-radical functionalisation of β-amino alcohols via 1,5-hydrogen atom abstraction in 1,3-oxazolidines
摘要:
Functionalisation of ethanolamine at the carbon atom ob to nitrogen can be achieved in a diastereoselective C-4 alkylation of 1,3-oxazolidines using free-medical methodology. (C) 1999 Elsevier Science Ltd. All rights reserved.
alternative to promote intramolecular carbene C–H insertion from α-diazoesters. Moreover, no competition arises from the possible metathesisreactions on substrates bearing alkene and alkyne moieties. DFT calculations were also carried out to gain insight into the reaction mechanism involved in these transformations.
Synthetic use of the primary kinetic isotope effect in hydrogen atom transfer: generation of α-aminoalkyl radicals
作者:Mark E. Wood、Sabine Bissiriou、Christopher Lowe、Andrew M. Norrish、Katell Sénéchal、Kim M. Windeatt、Simon J. Coles、Michael B. Hursthouse
DOI:10.1039/c0ob00205d
日期:——
deuterium can act as a protecting group to prevent unwanted 1,5-hydrogen atom transfer to aryl and vinyl radical intermediates was examined in the context of the generation of α-aminoalkyl radicals in a pyrrolidine ring. Intra- and intermolecular radical trapping following hydrogen atom transfer provides an illustration of the use of the primary kinetic isotope effect in directing the outcome of synthetic
A concise method for the functionalisation of ethanolamine α to nitrogen using free radical methodology
作者:Rajendra Gosain、Andrew M. Norrish、Mark E. Wood
DOI:10.1016/s0040-4020(00)01123-6
日期:2001.2
A method is described for the free radical functionalisation of ethanolamine at the carbon atom alpha to nitrogen. The key step of the methodology is a 1,5-hydrogen atom abstraction to produce an alpha-aminoalkyl radical at C-4 of a 1,3-oxazolidine. (C) 2001 Elsevier Science Ltd. All rights reserved.