[C:1]([O:5][C:6]([O:8]N=C(C1C=CC=CC=1)C#N)=O)([CH3:4])([CH3:3])[CH3:2].Cl.[F:20][CH2:21][CH:22]([NH2:26])[CH2:23][CH:24]=[CH2:25].C(N(CC)CC)C.O>O1CCCC1>[F:20][CH2:21][CH:22]([NH:26][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:8])[CH2:23][CH:24]=[CH2:25]Tert-Butoxycarbonyloxyimino-2-phenylacetonitrile (3.34 g, 13.6 mmoles) in dry tetrahydrofuran (40 ml) is slowly added with ice cooling to a stirred mixture of 1-fluoro-2-amino-4pentene hydrochloride (1.9 g, 13.6 mmoles) prepared in Example 2 and triethylamine (2.78 g, 27.2 mmoles) in tetrahydrofuran (30 ml). After standing overnight (about 16 hours) at room temperature, water is added, the tetrahydrofuran is removed under reduced pressure, and the residue is extracted twice with ether. After washing with 1 N sodium hydroxide, then with water until neutral, the organic layer is dried and concentrated at reduced pressure to give 1-fluoro-2-tert-butoxycarbonylamino-4-pentene (2.33 g, 85%) as an oil which is used in Example 4 without further purification.
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