作者:Oldrich Hudecek、Petra Curinova、Jan Budka、Pavel Lhoták
DOI:10.1016/j.tet.2011.05.049
日期:2011.7
The electrophilic substitution of 25,27-dipropoxy-26,28-dinosyloxycalix[4]arene leads exclusively to the para-substitution of the alkylated phenol rings, while in the next step, the protecting nosyl group can be easily removed using a basic hydrolysis. The overall process yields dialkoxycalix[4]arenes with the substitution on the alkylated rings—the substitution pattern, which is complementary to the
25,27-二丙氧基-26,28-二糖基氧基杯[4]芳烃的亲电取代仅导致烷基化苯酚环的对位取代,而在下一步中,可以使用碱性水解轻松除去保护性的烷基。整个过程产生在烷基化环上具有取代基的二烷氧基杯[4]芳烃,该取代模式与具有取代的非烷基化酚单元的普通二烷氧基杯[4]芳烃互补。通过合成新型杯芳烃二丙氧基衍生物和基于该取代模式制备新型阴离子受体,证明了这种保护/脱保护方法的有用性。