(5S,7R,16R,17E,19Z,23R,24S,26S,30S)-(-)-16-Ethyl-30-hydroxy-20-methoxymethyl-5,7-dimethyl-23,24-<(1-methylethyliden)-dioxy>-4,12,29-trioxo-26,28--3,28-diaza-17,19-tritriacontadiensaeure 在
4-二甲氨基吡啶 、
2,2'-二硫二吡啶 、
三苯基膦 作用下,
以
乙腈 为溶剂,
反应 96.0h,
以73%的产率得到(2S,6S,8S,9R,12Z,14E,16R,25R,27S)-(+)-16-Ethyl-12-methoxymethyl-25,27-dimethyl-8,9-<(1-methylethyliden)dioxy>-4,6<(1-methylethyliden)oxy>-2-propyl-1-oxa-4,29-diaza-12,14-cyclohentriacontadien-3,20,28,31-tetraon