Gold- and Silver-Mediated Cycloisomerizations of N-Propargylamides
摘要:
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.
An Aza-Enolate Alkylation Strategy for the Synthesis of α-Alkyl-δ-amino Esters and α-Alkyl Valerolactams
作者:Steven Bull、Piers Taylor、Philip Andrews
DOI:10.1055/s-2006-939726
日期:2006.6
Alkylation of the aza-enolate of valerolactim methyl ether with electrophiles affords α-alkyl lactims that may be hydrolysed under mild acidic conditions to afford their corresponding α-alkyl-δ-amino esters as their hydrochloride salts. Neutralisation of these salts with base results in smooth intramolecular cyclisation to afford their corresponding α-alkyl lactams in excellent yield.
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.