[Cl:1][CH2:2][CH2:3][S:4][CH2:5][C:6]([OH:8])=O.[NH2:9][CH2:10][C@H:11]1[C@H:19]2[N:14]([C:15]3[CH:23]=[CH:22][C:21]([N:24]4[CH2:29][CH2:28][O:27][CH2:26][C:25]4=[O:30])=[CH:20][C:16]=3[O:17][CH2:18]2)[C:13](=[O:31])[O:12]1.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>>[Cl:1][CH2:2][CH2:3][S:4][CH2:5][C:6]([NH:9][CH2:10][C@H:11]1[C@H:19]2[N:14]([C:15]3[CH:23]=[CH:22][C:21]([N:24]4[CH2:29][CH2:28][O:27][CH2:26][C:25]4=[O:30])=[CH:20][C:16]=3[O:17][CH2:18]2)[C:13](=[O:31])[O:12]1)=[O:8]Using compound 2-((2-chloroethyl)thio) acetic acid (58 mg, 0.377 mmol), compound (3S,3aS)-3-aminomethyl-7-(3-oxomorpholin-4-yl)-3a,4-dihydrobenzo[b]oxazolo[3,4-d][1,4]oxazin-1 (3H)-one (the product of step (e) in Example 1) (80 mg, 0.251 mmol), TEA (76.2 mg, 0.753 mmol), and HATU (171 mg, 0.452 mmol) as starting materials, preparation following the method as described in Example 11 (g) afforded white solid 70 mg, yield 61.3%.
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