(2S,3S,4S,8R,9R,10S,11R,12R,E)-2-ethyl-3-hydroxy-11-(4-methoxybenzyloxy)-4,6,8,10,12-pentamethyl-9-((2-(trimethylsilyl)ethoxy)methoxy)tetradec-6-enoic acid 在
吡啶 、
苯磺酰氯 作用下,
以86%的产率得到(3S,4S)-3-ethyl-4-((2S,6R,7R,8S,9R,10R,E)-9-(4-methoxybenzyloxy)-4,6,8,10-tetramethyl-7-((2-(trimethylsilyl)ethoxy)methoxy)dodec-4-en-2-yl)oxetan-2-one