Gold- and Silver-Mediated Cycloisomerizations of <i>N</i>-Propargylamides
作者:Guido Verniest、Albert Padwa
DOI:10.1021/ol801847j
日期:2008.10.2
Substituted N-propargylamides have proven to be valuable substrates for alkyne-activated cycloisomerization reactions. N-Tosyl-N'-propargylurea underwent reaction with AuCl3 to give the corresponding dihydroimidazolone, while N-propargyl-3-oxobutanamides and esters were used to construct furanyl fused pyrrolldinones and dihydrofuranones via Ag(I)-mediated alkyne activation.
Synthesis of 2-bromo-L-tryptophan and 2-chloro-L-tryptophan
作者:Robert S. Phillips、Louis A. Cohen
DOI:10.1016/s0040-4039(00)94139-x
日期:1983.1
Intramolecular general acid and general base catalyses in the hydrolysis of 2-halotryptophans and their analogs