Iodine → 4-((1R,2S)-2-(tert-butyldimethylsilyloxy)-1-(5-(4-(tert-butyldimethylsilyloxy)phenyl)-1,3,4-oxadiazol-2-yl)propylamino)-2-chloro-3-methylbenzonitrile
Reaction equation
[Si:1]([O:8][C:9]1[CH:42]=[CH:41][C:12]([C:13]([NH:15][NH:16][C:17](=O)[C@H:18]([NH:29][C:30]2[CH:35]=[CH:34][C:33]([C:36]#[N:37])=[C:32]([Cl:38])[C:31]=2[CH3:39])[C@@H:19]([O:21][Si:22]([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23])[CH3:20])=[O:14])=[CH:11][CH:10]=1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.II.[Si](O[C@@H](C)[C@@H](NC1C=CC(C#N)=C(Cl)C=1C)C1OC(C2C=CC=C(O[Si](C(C)(C)C)(C)C)C=2)=NN=1)(C(C)(C)C)(C)C>>[Si:22]([O:21][C@@H:19]([CH3:20])[C@@H:18]([NH:29][C:30]1[CH:35]=[CH:34][C:33]([C:36]#[N:37])=[C:32]([Cl:38])[C:31]=1[CH3:39])[C:17]1[O:14][C:13]([C:12]2[CH:41]=[CH:42][C:9]([O:8][Si:1]([C:4]([CH3:6])([CH3:5])[CH3:7])([CH3:3])[CH3:2])=[CH:10][CH:11]=2)=[N:15][N:16]=1)([C:25]([CH3:26])([CH3:27])[CH3:28])([CH3:23])[CH3:24]Participants
Procedure
Dehydrative cyclization of 4-(tert-butyldimethylsilyloxy)-N′-((2R,3S)-3-(tert-butyldimethylsilyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)butanoyl)benzohydrazide (intermediate 8b) (453 mg, 0.72 mmol) with performed with polystyrene supported triphenylphosphine (PS-PPh3) (3.0 mmol/g, 575 mg, 1.72 mmol), I2 (435 mg, 1.71 mmol), and TEA (0.8 mL, 5.7 mmol) as described in the preparation of intermediate 7c. After column chromatography (30% EtOAc/hexanes) the title compound was isolated as a white solid (329 mg, 75%). 1H NMR (500 MHz, CDCl3, δ in ppm) 7.81 (AA′XX′, J=8.7 Hz, 2H), 7.32 (d, J=8.6 Hz, 1H), 6.91 (AA′XX′, J=8.8 Hz, 2H), 6.47 (d, J=8.7 Hz, 1H), 5.35 (d, J=8.7 Hz, 1H), 4.77 (m, 1H), 4.52 (m, 1H), 2.36 (s, 3H), 1.40 (d, J=6.2 Hz, 3H), 0.98 (s, 9H), 0.86 (s, 9H), 0.22 (s, 6H), 0.06 (s, 3H), −0.18 (s, 3H).
Sources & evidence
- ORD record
- ord-7372b46455124d8abc7a2c5a39b103aa
- Source dataset
- uspto-grants-2014_01
- Patent number
- US08629167B2
Reaction notes
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