Synthesis of N-Boc-protected 1-amino-3-alken-2-ols from allylic carbamates via palladium(II)-catalyzed oxidative cyclization
作者:Rolf A. T. M. Van Benthem、Henk Hiemstra、W. Nico Speckamp
DOI:10.1021/jo00049a001
日期:1992.11
Methyl glyoxylate adducts of N-Boc-protected allylic amines cyclize in the presence of catalytic Pd(OAc)2 and excess Cu(OAc)2 in DMSO to 5-(1-alkenyl)-2-(methoxycarbonyl)oxazolidines. These heterocycles are readily converted to unsaturated N-Boc-protected beta-amino alcohols through anodic oxidation and mild hydrolysis.
Formamide as a superior nitrogen nucleophile in palladium(II) mediated synthesis of imidazolidines
作者:Rolf A.T.M. van Benthem、Henk Hiemstra、Gema Rodríguez Longarela、W.Nico Speckamp
DOI:10.1016/0040-4039(94)88488-9
日期:1994.12
Formamides emerge as superiornitrogennucleophiles in palladium(II) catalyzed oxidative 5-exo cyclizations of formaldehyde aminals derived from N-Boc protected allylic amines. The product imidazolidines are readily transformed into protected vicinal diamines.
Oxaziridine-Mediated Amination of Branched Allylic Sulfides: Stereospecific Formation of Allylic Amine Derivatives via [2,3]-Sigmatropic Rearrangement
作者:Alan Armstrong、Lee Challinor、Richard S. Cooke、Jennifer H. Moir、Nigel R. Treweeke
DOI:10.1021/jo060369s
日期:2006.5.1
Reaction of branched allylic sulfides with the N-Boc-oxaziridine 1 results in [2,3]-sigmatropicrearrangement of the intermediate allylic N-Boc-sulfimides with a high level of chirality transfer. The first example of formation of a quaternary stereocenter using this transformation is reported.