(+)-(1S,2R,3R)-3-Methoxymethyl-2-methyl-2-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-cyclopropanecarbaldehyde 、 (1R,2S,3R)-3-methoxymethyl-2-methyl-2-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-cyclopropylmethyl 4,7,7-trimethyl-3-oxo-2-oxa-bicyclo[2.2.1]heptane-1-carboxylate 以afforded the title compound (25 mg, 81% yield) as a colorless oil的产率得到(-)-(1R,2S,3R)-3-methoxymethyl-2-methyl-2-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-cyclopropanecarbaldehyde