vinyl dichlorides and electron deficient amides as the starting material is described. In the absence of transition-metal catalyst, the reaction proceeds under mild reaction conditions in open air and thus rendering a convenient operation. This strategy is not only suitable for both terminal and internal ynamide synthesis but also amenable for large-scale preparation. Broad substrate scopes with respect
Gold‐Catalyzed Intermolecular [4+2] Annulation of 2‐Ethynylanilines with Ynamides: An Access to Substituted 2‐Aminoquinolines
作者:Ximei Zhao、Xinlong Song、Hongming Jin、Zhongyi Zeng、Qian Wang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201800341
日期:2018.7.16
A gold‐catalyzedintermolecular [4+2] annulation of easily accessible 2‐ethynylanilines with ynamides offers a highly region‐selective, modular, efficient, and atom‐economical strategy for the synthesis of substituted2‐aminoquinolines in up to 93% yield.
Treatment of N-(1-alkynyl)amides and 1-alkynyl sulfides with diphenyldithiophosphinic acid affords (E)-ketene N,S-acetals and S,S-acetals, respectively. The addition reactions proceed in syn fashio...
Regio- and diastereoselective synthesis of <i>trans</i>-3,4-diaryldihydrocoumarins <i>via</i> metal-free [4+2] annulation of ynamides with <i>o</i>-hydroxybenzyl alcohols
trans-3,4-diaryldihydrocoumarins via metal-free [4+2] annulation of ynamides with o-hydroxybenzyl alcohols has been developed. Ynamides are first treated as 2–π partners to react with o-hydroxybenzyl alcohols via traceless sulfonamide directinggroups, affording trans-3,4-diaryldihydrocoumarins in good yields with high regio- and diastereoselectivities. This metal-free methodology is also characterized
Regio- and Stereoselective Hydrothiolation Reactions of Ynamides with Diphenyldithiophosphinic Acid: Straightforward Synthesis of Ketene<i>N</i>,<i>S</i>-Acetal Derivatives
作者:Hiroto Yasui、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/cl.2008.40
日期:2008.1.5
Treatment of N-1-alkynyl-N-methylarenesulfonamides with diphenyldithiophosphinic acid resulted in hydrothiolation reactions to provide ketene N,S-acetal derivatives regio- and stereoselectively.