2-氧代环戊羧酸乙酯 、
(E)-4-chloro-2-(2-nitroethenyl)phenol 在
N-[3,5-双(三氟甲基)苯基]-N'-[(8a,9S)-6'-甲氧基-9-金鸡宁]硫脲 作用下,
以
二氯甲烷 为溶剂,
生成 6-chloro-4-(nitromethyl)spiro[chroman-3,1'-cyclopentane]-2,2'-dione 、 ethyl 7-chloro-3a-hydroxy-9-(nitromethyl)-1,2,3,3a,9,9a-hexahydrocyclopenta[b]chromene-9acarboxylate 、 (R)-ethyl 1-[(S)-1-(5-chloro-2-hydroxyphenyl)-2-nitroethyl]-2-oxocyclopentanecarboxylate 、
(3aS,9R,9aS)-ethyl 7-chloro-3a-hydroxy-9-(nitromethyl)-1,2,3,3a,9,9a-hexahydrocyclopenta[b]chromene-9acarboxylate