Synthesis of Spiro[4.5]trienones by Intramolecular <i>i</i><i>pso</i>-Halocyclization of 4-(<i>p</i>-Methoxyaryl)-1-alkynes
作者:Xiaoxia Zhang、Richard C. Larock
DOI:10.1021/ja053079m
日期:2005.9.1
A wide variety of 3-halospiro[4.5]trienones are readily prepared in good to excellent yields by the intramolecular ipso-halocyclization of 4-(p-methoxyaryl)-1-alkynes under mild reaction conditions. ICl, I2, and Br2 are all effective electrophiles for this process under carefully optimized reaction conditions.