[CH3:1][O:2][CH2:3][CH:4]1[CH2:9][CH2:8][C:7](=O)[CH2:6][CH2:5]1.C1(C)C(S([CH2:20][N+:21]#[C-])(=O)=O)=CC=CC=1.CC(C)([O-])C.[K+]>C(COC)OC.C(O)C>[CH3:1][O:2][CH2:3][CH:4]1[CH2:9][CH2:8][CH:7]([C:20]#[N:21])[CH2:6][CH2:5]1To a cold (−10° C.) solution of EXAMPLE 374C (1.18 g) and toluenesulfonylmethyl isocyanide (2.268 g) in dimethoxyethane (3 mL) and absolute ethanol (0.1 mL) was added (in small portions) potassium tert-butoxide (2.235 g). The reaction mixture was continued to stir at <5° C. for 30 minutes, warmed to room temperature, heated at 35° C. for 30 minutes and then at room temperature for 2 hours. The reaction mixture was concentrated and the residue was dissolved in water-brine, and extracted with dichloromethane. The dichloromethane layer was purified by flash chromatography, and was eluted with 5% ethyl acetate in dichloromethane to provide the title compound.
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