hexa-2Z,4E-dienoic acid 3R,9R-bis(tert-butyldimethylsilanyloxy)-12-[2,2-dimethyl-6S-(1-methylallyl)-[1S,3S]-dioxan-4-yl]-2R,8S,10S-trimethyl-1S-(1S-methylpent-2Z-enyl)-dodec-11Z-enyl ester 在
RuCl2(1,3-dimesityl-imidazolidin-2-yl)(PCy3)(=CHPh) 、
titanium(IV) isopropylate 作用下,
以
甲苯 为溶剂,
反应 1.0h,
以65%的产率得到11R,17R-bis(tert-butyldimethylsilanyloxy)-2S,10R,16S,18S,23,23-hexamethyl-9S-(1S-methylpent-2Z-enyl)-8,22,24-trioxabicyclo[19.3.1]pentacosa-3E,5Z,19Z-trien-7-one