Reaction of Arynes with Vinylogous Amides: Nucleophilic Addition to the ortho-Quinodimethide Intermediate
摘要:
The reaction of arynes with vinylogous amides containing no free N-H bonds proceeds in a [2 + 2] cycloaddition fashion at ambient temperature. The electronic properties of the vinylogous amides allow for the cycloadducts undergoing a facile ring-opening process, leading to electronically biased ortho-quinodimethide intermediates. Subsequent nucleophilic addition with alcohols affords 2-substituted benzaldehydes or ketones.
Efficient tandem synthesis of 3-alkylaminoprop-2-enamides from 3-trimethylsilylprop-2-ynamides
作者:M. V. Andreev、A. S. Medvedeva、L. P. Safronova
DOI:10.1134/s1070428013060031
日期:2013.6
A tandem synthetic approach to previously unknown 3-aminoprop-2-enamides has been developed. It is based on Si-C (sp) desilylation of 3-trimethylsilylprop-2-ynamides and subsequent addition of an amine to the triple bond of intermediate terminal propynamides. The effects of the reaction conditions and amine nature on the efficiency of the process have been studied.