甲醇 、
(E)-3-(2-((E)-4,4-dimethyl-3-oxopent-1-enyl)phenyl)acrylaldehyde 在
(5aS,6R,9S,9aR)-5a,6,7,8,9,9a-Hexahydro-6,11,11-trimethyl-2-(2,4,6-trimethylphenyl)-6,9-methano-4H-[1,2,4]triazolo[3,4-c][1,4]benzoxazinium tetrafluoroborate 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以85%的产率得到methyl (1R,2R)-(3,3-dimethyl-2-oxobutyl)-2,3-dihydro-1H-indene-2-carboxylate