10-[17-(tert-butyl-dimethyl-silanyloxy)-3,5,7-trimethoxy-4,8,14-trimethyl-11-oxo-10,23-dioxa-bicyclo[17.3.1]tricosa-12,14,20-trien-9-yl]-3-methoxy-2,4,8-trimethyl-5-oxo-9-triethylsilanyloxy-undecanal 、
碘甲烷 在
chromium dichloride 作用下,
以
四氢呋喃 为溶剂,
反应 1.0h,
以69%的产率得到(1R,3S,5E,7E,11S,12S,13R,15S,16R,17S,19S)-3-[tert-butyl(dimethyl)silyl]oxy-11-[(E,2R,3S,4S,8R,9R,10R)-12-iodo-9-methoxy-4,8,10-trimethyl-7-oxo-3-triethylsilyloxydodec-11-en-2-yl]-13,15,17-trimethoxy-6,12,16-trimethyl-10,23-dioxabicyclo[17.3.1]tricosa-5,7,21-trien-9-one