An Easy and Convenient Synthesis of Weinreb Amides and Hydroxamates
作者:Lidia De Luca、Giampaolo Giacomelli、Maurizio Taddei
DOI:10.1021/jo015524b
日期:2001.4.1
Synthesis of 3,5-Disubstituted Isoxazoles through a 1,3-Dipolar Cycloaddition Reaction between Alkynes and Nitrile Oxides Generated from <i>O</i>
-Silylated Hydroxamic Acids
by 1,3‐dipolar cycloaddition between alkynyl dipolarophiles and nitrile oxide dipoles generated in‐situ from O‐silylated hydroxamicacids in the presence of trifluoromethanesulfonic anhydride and NEt3. Thanks to the mild, metal‐free and oxidant‐free conditions that this strategy offers, the reaction was successfully applied to a wide variety of alkynyl dipolarophiles, demonstrating the tolerance of this
A Novel, General Method for the Synthesis of Nitrile Oxides: Dehydration of <i>O</i>-Silylated Hydroxamic Acids
作者:Dieter Muri、Jeffrey W. Bode、Erick M. Carreira
DOI:10.1021/ol991396q
日期:2000.2.1
O-Silylated hydroxamicacids serve as stable, readily accessible, crystalline precursors to nitrile oxides when treated with trifluoromethanesulfonic anhydride and triethylamine. Under these mild conditions in the presence of olefins O-silylated hydroxamicacids afford isoxazoline cycloadducts. This procedure represents a novel, general method for the one-step generation of nitrile oxides, which complements