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Preparation 16 Synthesis of benzyl 1-[t-butyl(diphenylsilyl)oxy]methylcyclopropyl} (methyl) carbamate The carboxylate prepared in Preparation 15 (13.2g) was dissolved in diethylether, to which 1. 3g of LiBH4 dissolved in diethylether was slowly added dropwise. The reaction mistwe was stirred at room temperature for 16 hours, and 50mg of methanol and 5 mt of IN HCI were added dropwise thereto. The reaction mixture was stirred for 2 hours, the precipitate was removed by suction filtration, and the solvent in the filtrate was removed by distillation under reduced pressure. The residue was purified by silica gel column to give benzyl 1- (hydroxymethyl) cyclopropylcarbamate.