Diastereoselective, silver(I)-catalysed cyclisations of acetylenic isoureas to oxazolidines and oxazines; acetic acid-induced conversion of the alkylideneoxazines into 2-N-substituted (1Z,3E)-1,3-dienes
作者:William Clegg、Stephen P. Collingwood、Bernard T. Golding、Susan M. Hodgson
DOI:10.1039/c39880001175
日期:——
O-Acetylenic isoureas R1CC[CH2]nCHR2OC(=NPri)NHPri(n= 0 or 1, e.g. R1= Me, R2= H) undergo diastereoselective, AgI-catalysed cyclisation to oxazolidines (n= 0) or oxazines (n= 1); the latter are converted into 2-N-substituted (1Z,3E)-1,3-dienes on treatment with acetic acid.
COLLINGWOOD, STEPHEN P.;DAVIES, ALAN P.;GOLDING, BERNARD T., TETRAHEDRON LETT., 28,(1987) N 38, 4445-4448
作者:COLLINGWOOD, STEPHEN P.、DAVIES, ALAN P.、GOLDING, BERNARD T.
DOI:——
日期:——
Conversion of alcohols into alkyl bromides and iodides via O-alkylisoureas
作者:Stephen P. Collingwood、Alan P. Davies、Bernard T. Golding
DOI:10.1016/s0040-4039(00)96534-1
日期:1987.1
Treatment of O-alkylisoureas with trifluoromethanesulphonic acid and a tetrabutylammonium salt (bromide or iodide) affords alkyl halides in high yields.