(Z)-N-(n-butylidene)methylamine N-oxide 、
methyl (2E)-2-[(3aR,6R,6aR)-6-(methoxymethoxymethyl)-2,2-dimethyl-6,6a-dihydro-3aH-furo[3,4-d][1,3]dioxol-4-ylidene]acetate 以
甲苯 为溶剂,
反应 1.58h,
以101 mg的产率得到methyl (3R,4R,5S,7R,8R,9R)-8,9-isopropylidenedioxy-2-methyl-7-[(methoxymethoxy)methyl]-3-propyl-1,6-dioxa-2-azaspiro[4.4]nonane-4-carboxylate