3,9,15,21-tetratert-butyl-37,38-dihydroxy-25,34-dioxaheptacyclo[21.12.1.17,11.113,17.05,35.019,24.027,32]octatriaconta-1,3,5(35),7,9,11(38),13(37),14,16,19(24),20,22,27,29,31-pentadecaene-26,33-dione 、
溴乙酸乙酯 在
sodium hydride 作用下,
以
四氢呋喃 为溶剂,
反应 15.0h,
以43%的产率得到5,11,17,23-tetra-tert-butyl-25-<(ethoxycarbonyl)methoxy>-26-hydroxy-27,28-(phthaloyldioxy)calix<4>arene