p-Toluenesulfonic acid → (1R,cis)2,2-dimethyl-3-(pentyloxycarbonyl-ethynyl)-cyclopropane-carboxylic acid
反応式
[CH3:1][C:2]1([CH3:22])[C@@H:4]([C:5]#[C:6][C:7]([O:9][CH2:10][CH2:11][CH2:12][CH2:13][CH3:14])=[O:8])[C@H:3]1[C:15]([O:17]C(C)(C)C)=[O:16].C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[CH3:22][C:2]1([CH3:1])[C@@H:4]([C:5]#[C:6][C:7]([O:9][CH2:10][CH2:11][CH2:12][CH2:13][CH3:14])=[O:8])[C@H:3]1[C:15]([OH:17])=[O:16]参加物
4
実験手順
A mixture of 5.24 g of the product of Step A, 50 ml of toluene and 250 mg of p-toluene sulfonic acid was refluxed until gas evolution ceased and was then evaporated to dryness under reduced pressure to obtain 4.8 g of crude (1R,cis)2,2-dimethyl-3-(pentyloxycarbonyl-ethynyl)-cyclopropane-carboxylic acid which was used as is for the next step.