4-Aminobenzonitrile → 4-(5-chloro-2-methoxy-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid (4-cyano-phenyl)-amide

HRID 641273Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([O:24][CH3:25])=[C:6]([S:8]([N:11]2[C:16]3[CH:17]=[C:18]([C:21]([OH:23])=O)[CH:19]=[CH:20][C:15]=3[O:14][CH2:13][CH2:12]2)(=[O:10])=[O:9])[CH:7]=1.C(N(CC)C(C)C)(C)C.F[P-](F)(F)(F)(F)F.Br[P+](N1CCCC1)(N1CCCC1)N1CCCC1.[NH2:59][C:60]1[CH:67]=[CH:66][C:63]([C:64]#[N:65])=[CH:62][CH:61]=1>ClCCl>[C:64]([C:63]1[CH:66]=[CH:67][C:60]([NH:59][C:21]([C:18]2[CH:19]=[CH:20][C:15]3[O:14][CH2:13][CH2:12][N:11]([S:8]([C:6]4[CH:7]=[C:2]([Cl:1])[CH:3]=[CH:4][C:5]=4[O:24][CH3:25])(=[O:10])=[O:9])[C:16]=3[CH:17]=2)=[O:23])=[CH:61][CH:62]=1)#[N:65]

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of 4-(5-chloro-2-methoxy-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid (example 1, steps 1 to 4) (1.0 g, 2.6 mmol) in dichloromethane (50 mL) was treated with N,N-diisopropyl ethyl amine (0.34 g, 2.6 mmol) and cooled to 0° C. Bromo-tris-pyrrolidino-phosphonium hexafluorophosphate (2.4 g, 5.2 mmol) was added, and the mixture was stirred at 0° C. for 1 min. 4-Aminobenzonitrile (1.2 g, 10.4 mmol) was added and the mixture was stirred at room temperature overnight. The solvent was evaporated, and the crude was purified by flash chromatography (heptane/ethyl acetate gradient) yielding 4-(5-chloro-2-methoxy-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid (4-cyano-phenyl)-amide as a white solid, 0.18 g (14%), MS (ISP): m/e=482.0 (M−H).

Workup

stirringthe mixture was stirred at room temperature overnight
customThe solvent was evaporated
customthe crude was purified by flash chromatography (heptane/ethyl acetate gradient)

Sources & evidence

ORD record: ord-2656efa878314b29bf6c1505d5d63328
Source dataset: uspto-grants-2010_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07696200B2

Reaction notes

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