Z-β-chloroacrylic acid p-nitrophenyl ester 、 (S)-5-((1S,3S)-3-Isobutyryl-4,4-dimethyl-2-oxo-cyclohexylmethyl)-4,4-dimethyl-[1,3]dioxolan-2-one 生成 (R)-4a-((S)-5,5-Dimethyl-2-oxo-[1,3]dioxolan-4-ylmethyl)-8-isobutyryl-7,7-dimethyl-4a,5,6,7-tetrahydro-chromen-2-one 、 (S)-4a-((S)-5,5-Dimethyl-2-oxo-[1,3]dioxolan-4-ylmethyl)-8-isobutyryl-7,7-dimethyl-4a,5,6,7-tetrahydro-chromen-2-one