[F:1][C:2]1[C:11]2[N:10]3[CH2:12][CH2:13][CH2:14][CH:9]3[CH2:8][O:7][C:6]=2[CH:5]=[C:4]([NH2:15])[CH:3]=1.C[Al](C)C.N#N.[NH:22](/[C:26](/[CH3:32])=[CH:27]\[C:28](OC)=[O:29])[C:23]([CH3:25])=O>C(Cl)Cl>[F:1][C:2]1[C:11]2[N:10]3[CH2:12][CH2:13][CH2:14][CH:9]3[CH2:8][O:7][C:6]=2[CH:5]=[C:4]([N:15]2[C:28](=[O:29])[CH:27]=[C:26]([CH3:32])[N:22]=[C:23]2[CH3:25])[CH:3]=1To a solution of 9-fluoro-2,3,3a,4-tetrahydro-1H-benzo[b]pyrrolo[1,2-d][1,4]oxazin-7-amine (2.00 g, 9.61 mmol) in anhydrous CH2Cl2 (50 mL) was added trimethylaluminum (48 mL, 48 mmol, 1 M in heptane) slowly under N2. Upon the end of addition the mixture was stirred at rt for 40 min, followed by addition of a solution of methyl 3-acetaminocrotonate (2.66 g, 16.92 mmol) in anhydrous CH2Cl2 (30 mL) dropwise. The reaction mixture was stirred at rt for another 5 h, then quenched with an appropriate amount of water. The organic phase was washed with brine, dried over anhydrous Na2SO4 and concentrated in vacuo to give the title compound as a white solid (1.00 g, 33.0%). The compound was characterized by the following spectroscopic data:
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