Synthesis of Multiple-Substituted Pyrroles via Gold(I)-Catalyzed Hydroamination/Cyclization Cascade
摘要:
A gold-catalyzed cascade hydroamination/cyclization reaction of alpha-amino ketones with alkynes to form substituted pyrroles has been developed. The method offers several advantages such as high regioselectivity with the tested cases, wide functional group tolerance, and easily accessible starting materials. The synthetic utility of the obtained pyrrole products was demonstrated by their efficient transformations to 2-vinylated pyrroles via gold-catalyzed intermolecular hydroarylation.
Thieme Chemistry Journals Awardees – Where Are They Now? A Cascade Synthesis of 1,2,4-Triazin-3(2H)-ones Using Nitrogen-Substituted Isocyanates
作者:André Beauchemin、Mohammed Dahab、Joshua Derasp
DOI:10.1055/s-0036-1588099
日期:——
A cascadesynthesis of 1,2,4-triazin-3(2H)-ones is reported from readily accessible α-amino ketones and phenyl carbazate as a masked N-isocyanate precursor. The mild protocol provides a simple route to products with substitution patterns which are difficult to form directly. This also presents the first N-isocyanate cascade requiring the use of acidic conditions, which accelerates formation of the