Isopropyl Acetate → (r)-5-Biphenyl-4-ylmethyl-3-[1-diisopropylamino-meth-(e)-ylidene]-2-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 2174842Notes

Reaction equation

F[B-](F)(F)F.C(N(C(C)C)[CH:10]=[N+:11]([CH:15]([CH3:17])[CH3:16])[CH:12]([CH3:14])[CH3:13])(C)C.CC(C)([O-])C.[K+].[C:27]([O:31][C:32]([N:34]1[C:38](=[O:39])[CH2:37][CH2:36][C@H:35]1[CH2:40][C:41]1[CH:46]=[CH:45][C:44]([C:47]2[CH:52]=[CH:51][CH:50]=[CH:49][CH:48]=2)=[CH:43][CH:42]=1)=[O:33])([CH3:30])([CH3:29])[CH3:28].C(OC(C)C)(=O)C>C1COCC1>[C:27]([O:31][C:32]([N:34]1[C@H:35]([CH2:40][C:41]2[CH:42]=[CH:43][C:44]([C:47]3[CH:48]=[CH:49][CH:50]=[CH:51][CH:52]=3)=[CH:45][CH:46]=2)[CH2:36]/[C:37](=[CH:10]\[N:11]([CH:12]([CH3:13])[CH3:14])[CH:15]([CH3:16])[CH3:17])/[C:38]1=[O:39])=[O:33])([CH3:30])([CH3:28])[CH3:29]

Participants

Conditions

Temperature: 60 °C

Procedure

N,N,N′,N′-tetraisopropylformamidinium tetrafluoroborate (2.13 g, prepared according to Example 11) is added to a 1 M solution of potassium-tert-butoxide in THF (5.69 ml). The resulting mixture is then stirred for 1 h at 50° C. (S)-2-Biphenyl-4-ylmethyl-5-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester (8-a, R1=Boc) (500 mg) is then added and the mixture stirred at 60° C. for 1 h. The mixture is then cooled to room temperature and diluted by addition of 10 ml isopropyl acetate. The mixture is then filtered through silica and concentrated in vacuo to afford (R)-5-biphenyl-4-ylmethyl-3-[1-diisopropylamino-meth-(E)-ylidene]-2-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester (7-a, R1=Boc, R6=iPr, R7=iPr). Spectroscopic data as for Example 19, Method 1.

Workup

additionis then added
temperatureThe mixture is then cooled to room temperature
filtrationThe mixture is then filtered through silica
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-36771af4414546bb9299430800c301cc
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09061973B2

Reaction notes

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