[CH:1]1([C:4]#[C:5][CH2:6][OH:7])[CH2:3][CH2:2]1.[S:8](Cl)([C:11]1[CH:17]=[CH:16][C:14]([CH3:15])=[CH:13][CH:12]=1)(=[O:10])=[O:9].C(N(CC)CC)C>C(Cl)Cl.CN(C1C=CN=CC=1)C>[CH3:15][C:14]1[CH:16]=[CH:17][C:11]([S:8]([O:7][CH2:6][C:5]#[C:4][CH:1]2[CH2:3][CH2:2]2)(=[O:10])=[O:9])=[CH:12][CH:13]=1To a stirred solution of crude 3-cyclopropylprop-2-yn-1-ol (intermediate AT) (0.55 mg) in 10 mL of CH2Cl2 was added TsCl (1.33 g, 6.87 mmol) and DMAP (0.035 g, 0.2865 mmol) at 0° C. Triethylamine (0.96 mL, 6.87 mmol) was added dropwise to the mixture and the reaction temperature was held so as not to exceed 0° C. After stirring for 3 h, the mixture was quenched with 10 mL of water. The aqueous layer was extracted twice with 20 mL each of CH2Cl2. The organic layer was washed with 20% HCl and water prior to drying over anhydrous Na2SO4. The organic phase was concentrated and the crude product was purified by gel column chromatography to obtain intermediate AU (0.4 g).
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