O[CH2:2][C:3]1([NH:6][C:7](=[O:13])[O:8][C:9]([CH3:12])([CH3:11])[CH3:10])[CH2:5][CH2:4]1.N12CCCN=C1CCCCC2.C1(P([N:39]=[N+:40]=[N-:41])(C2C=CC=CC=2)=O)C=CC=CC=1>CN(C)C=O.O>[N:39]([CH2:2][C:3]1([NH:6][C:7](=[O:13])[O:8][C:9]([CH3:12])([CH3:11])[CH3:10])[CH2:5][CH2:4]1)=[N+:40]=[N-:41]To a solution of tert-butyl [1-(hydroxymethyl)cyclopropyl]carbamate (1 g, 5.3 mmol) in N,N-dimethylformamide (20 mL) was added 1,8-diazabicyclo[5.4.0]undec-7-ene (1.22 g, 8.0 mmol) and diphenylphosphoryl azide (2.33 g, 8.00 mmol). After the mixture was stirred at 80° C. for 3 hours, another batch of 1,8-diazabicyclo[5.4.0]undec-7-ene (1.22 g, 8.0 mmol) and diphenylphosphoryl azide (2.33 g, 8.00 mmol) was introduced and the mixture was stirred at 80° C. for another 2 hours. The resulting mixture was then diluted with water (20 mL) and extracted with ethyl acetate (30 mL×2). The combined organic layers were used for next step directly.
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