dimethyl (2β,3α,4α,8α,9α,10β,12β,13α,16α,17β)-6-tert-butoxycarbonylaminoethyl-6-aza-19-oxa-5,7-dioxoheptacyclo[9.6.1.1(3,9).1(13,16).0(2,10).0(4,8).0(12,17)]icosa-14-ene-1,11-dicarboxylate 、 dimethyl (1α,2β,6β,7α)-8,9-di[(tert-butoxycarbonylamino)ethylcarboxamido]-4-oxatetracyclo[5.2.1.0(2,6).0(3,5)]deca-8-ene-3,5-dicarboxylate 以
四氢呋喃 为溶剂,
反应 66.0h,
以67%的产率得到tetramethyl (1α,2β,4β,5α,6α,10α,11α,12β,14β,15α,16β,18β,19α,22α,23β,25β)-tert-butoxycarbonylaminoethyl-20,21-di[(tert-butoxycarbonylamino)ethylcarboxamido]-8-aza-27,29-dioxa-7,9-dioxoundecacyclo[13.10.1.1(3,13).1(5,11).1(17,24).1(19,22).0(2,14).0(4,12).0(6,10).0(16,25).0(18,23)]triaconta-20-ene-3,13,17,24-tetracarboxylate