Mercuric Chloride and Iodide Mediated Cyclization of Tethered Alkynedithioacetals as a General Route to Five- and Six-Membered Rings: Tuning of Regioselectivity by Alkyne Substitution
作者:Goutam Biswas、Subir Ghorai、Anup Bhattacharjya
DOI:10.1021/ol0527274
日期:2006.1.1
Mercuric chloride mediated cyclization of tethered alkynedithioacetals has been established as a generalroute to five- and six-memberedcarbocycles and heterocycles. Substitution at the alkyne terminus leads to preferential formation of five-membered rings, whereas unsubstituted alkynedithioacetals give six-membered rings as the major products. Mercuric iodide interrupts the reaction at the intermediate dithioacetal