反式-2-丁烯酸乙酯 、
benzyl N-[2-(dimethylamino)-2-oxoethyl]-N-[(1R,2R,2'R,4R)-1,7,7-trimethylspiro[bicyclo[2.2.1]heptane-2,6'-oxane]-2'-yl]carbamate 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
反应 3.0h,
以100%的产率得到ethyl (3S,4R)-4-(((benzyloxy)carbonyl)((1R,2R,4R,6'R)-1,7,7-trimethyltetrahydrospiro[bicyclo[2.2.1]heptane-2,2'-pyran]-6'-yl)amino)-5-(dimethylamino)-3-methyl-5-oxopentanoate