X=Y-ZH systems as potential 1,3-dipoles. Part 31. Generation of nitrones from oximes. Background and scope of the tandem 1,2-prototropy-intramolecular cycloaddition sequence.
作者:Ronald Grigg、Frances Heaney、Jasothara Markandu、Sivagnanasundram Surendrakumar、Thornton-Pett Mark、Warnock J. William
DOI:10.1016/s0040-4020(01)86441-3
日期:1991.1
and electronic factors that favour or disfavour such a sequence are discussed. Deuterium labelling studies with an aliphatic oxime rule out the involvement of an enehydroxylamine in the prototropic generation of the NH nitrone.
X = Y - ZH systems as potential 1,3-dipoles part 35. Generation of nitrones from oximes. Class 3 processes. Tandem intramolecular michael addition (1,3-azaprotio cyclotransfer) - intermolecular 1,3-dipolar cycloaddition reactions.
作者:Ronald Grigg、Jasothara Markandu、Trevor Perrior、Sivagnanasundram Surendrakumar、William J. Warnock
DOI:10.1016/s0040-4020(01)89883-5
日期:1992.1
Aldoximes and ketoximes possessing gamma- or delta-alkenyl substituents undergo thermal conversion to 5- and 6- membered cyclic nitrones via a 1,3-azaprotio cyclotransfer, a 2n + 2-sigma + 2-pi concerted process, rather than a Michael addition. The reactions can be performed as a tandem nitrone formation-cycloaddition sequence or, if required, the intermediate nitrones can be isolated. The cycloadditions usually proceed via an exo-transition state and show both regio- and diastereofacial-specificity. Preliminary attempts at chiral induction via a menthyl auxiliary are reported.