3-Bromo-6-methoxy-2-(trifluoromethyl)pyridine 、 rac-benzyl (3S,4S)-2'-(2-ethoxypyridin-3-yl)-3-ethyl-6'H-spiro[piperidine-4,5'-[1,7]naphthyridine]-7'(8'H)-carboxylate 在
tris-(dibenzylideneacetone)dipalladium(0) 、
4,5-双二苯基膦-9,9-二甲基氧杂蒽 、
sodium t-butanolate 作用下,
以
甲苯 为溶剂,
以54 %的产率得到rac-benzyl (3S,4S)-2'-(2-ethoxypyridin-3-yl)-3-ethyl-1-(6-methoxy-2-(trifluoromethyl)pyridin-3-yl)-6'H-spiro[piperidine-4,5'-[1,7]naphthyridine]-7'(8'H)-carboxylate