The addition of vinyl and ethynyl organometallic reagents to the nitrone derived from D-glyceraldehyde affords allyl and propargyl hydroxylamines which are easily converted into the corresponding allyl and propargylamines. The stereoselectivity of the addition step can be controlled by the presence (or absence) of diethyl aluminium chloride.
A General Method for the Vinylation of Nitrones. Synthesis of Allyl Hydroxylamines and Allyl Amines
作者:Pedro Merino、Sonia Anoro、Santiago Franco、Jose M. Gascon、Victor Martin、Francisco L. Merchan、Julia Revuelta、Tomas Tejero、Victoria Tuñon
DOI:10.1080/00397910008087449
日期:2000.8
An examination of the vinylation of several nitrones is presented. Whereas a complete diastereofacial discrimination was observed upon the addition of vinyl organometallic reagents to alpha-alkoxy nitrones, the same reaction with alpha-amino nitrones pave syn adducts in all cases, with the only exception of a L-serine-derived alpha-amino monoprotected nitrone. The obtained allyl hydroxylamines were easily transformed into synthetically valuable allyl amines.
Novel [2,3]-Sigmatropic Rearrangement for Carbon−Nitrogen Bond Formation