(5S,6R)-5,6-dimethyl-3-methyleneoxepan-2-one 、
(2S,5R,6R,8R,10R)-2-(2-benzyloxy)ethyl-10-[(1S,2R,3R,5R,7S)-2-(tert-butyldimethylsilyl)oxy-[(1E)-3-(tert-butyldiphenylsilyl)oxymethylbuta-1,3-dienyl]-3-methyl-6,8-dioxabicyclo[3.2.1]octan-5-ylmethyl]-5-methyl-5-(triethylsilyl)oxy-1,7,9-trioxadispiro[5.1.5.2]pentadecane 以
对二甲苯 为溶剂,
反应 12.0h,
以35%的产率得到(1S,6R,10R,11S)-1-[(1S,2R,3R,5R,7S)-5-[(2S,5R,6R,8R,10R)-2-(2-benzyloxy)ethyl-5-methyl-5-(triethylsilyl)oxy-1,7,9-trioxadispiro[5.1.5.2]pentadecan-10-ylmethyl]-2-(tert-butyldimethylsilyl)oxy-3-methyl-6,8-dioxabicyclo[3.2.1]octan-7-yl]-3-(tert-butyldiphenylsilyl)oxymethyl-10,11-dimethyl-8-oxaspiro[5.6]dodec-2-en-7-one