1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → 1-(2-(Trimethylsilyl)ethyl) 1'-tert-butyl 5-(methylthio)spiro[indoline-3,3'-pyrrolidine]-1,1'-dicarboxylate

HRID 1411287Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]2[C:10]3([CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:11]3)[CH2:9][N:8]([C:22]([O:24][CH2:25][CH2:26][Si:27]([CH3:30])([CH3:29])[CH3:28])=[O:23])[C:5]2=[CH:6][CH:7]=1.[CH3:31][S-:32].[Na+].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>C1(C)C(C)=CC=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[CH3:31][S:32][C:2]1[CH:3]=[C:4]2[C:10]3([CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:11]3)[CH2:9][N:8]([C:22]([O:24][CH2:25][CH2:26][Si:27]([CH3:30])([CH3:29])[CH3:28])=[O:23])[C:5]2=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 150 °C

Procedure

1-(2-(Trimethylsilyl)ethyl) 1′-tert-butyl 5-bromospiro[indoline-3,3′-pyrrolidine]-1,1′-dicarboxylate (300 mg, 0.603 mmol) was dissolved in xylene (10 mL). Thereafter, sodium thiomethoxide (85 mg, 1.21 mmol), tris(dibenzylideneacetone)dipalladium(0) (100 mg, 0.11 mmol), and xantphos (87.0 mg, 0.15 mmol) were added to the above obtained solution at room temperature, and the thus obtained mixture was then stirred at 150° C. for 1 hour. Thereafter, the reaction solution was purified by silica gel column chromatography (hexane:ethyl acetate=3:1) to obtain 1-(2-(trimethylsilyl)ethyl) 1′-tert-butyl 5-(methylthio)spiro[indoline-3,3′-pyrrolidine]-1,1′-dicarboxylate (192 mg, 69%) in the form of a white amorphous product.

Workup

customThereafter, the reaction solution was purified by silica gel column chromatography (hexane:ethyl acetate=3:1)

Sources & evidence

ORD record: ord-779cc60712264c169f2ef86d5eff06c3
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08921576B2

Reaction notes

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