A novel approach to inherently chiral calix[4]arenes by direct introduction of a substituent at the meta position
作者:Willem Verboom、Paul J. Bodewes、Georget van Essen、Peter Timmerman、Gerrit J. van Hummel、Sybolt Harkema、David N. Reinhoudt
DOI:10.1016/0040-4020(94)00911-d
日期:1995.1
A novel method for the preparation of inherently chiral calix[4]arenes is described by direct introduction of a substituent in para-acetamido substituted calix[4]arenes. Bromination and nitration of mono(acetamido)calix[4]arenes 5, 6 afforded calix[4]arenes 7–10, in which the substituent was selectively introduced adjacent to the acetamido moiety, in 58–98% yield. Bromination of bis(acetamido)calix[4]arene