Reaktion #1815276

Reaktionsgleichung

methanol

1-(1-ethyl-ethenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene

1-(1-methylene-propyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene

Z-6-Bromo-3-(3-chloro-benzylidene)-1-(2-trimethylsilanyl-ethoxymethyl)-1,3-dihydro-indole-2-one

→

racemic (2′R,3R,4′S)-6-bromo-4′-(3-chlorophenyl)-2′-(1-methylene-propyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine] 1-methoxyethyl trimethylsilane

Ausbeute 13.7%

Lösungsmittel

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling to room temperature
2. 2
   Einengenthe mixture was concentrated
3. 3
   SonstigeThe residue was purified by chromatography (EtOAc:Hexane=2:1)

Vorschrift

To a solution of 1-(1-ethyl-ethenyl)-3-trimethylsilyoxy-2-aza-1,3-butadiene (42 mmol) prepared in example 80a in toluene (50 mL) was added E/Z-6-Bromo-3-(3-chloro-benzylidene)-1-(2-trimethylsilanyl-ethoxymethyl)-1,3-dihydro-indole-2-one (2 g, 4.3 mmol) prepared in example 161a. The reaction mixture was stirred under nitrogen in a sealed tube at 135° C. for 1 h. After cooling to room temperature, methanol (100 mL) was added, and then the mixture was concentrated. The residue was purified by chromatography (EtOAc:Hexane=2:1) gave racemic (2′R,3R,4′S)-6-bromo-4′-(3-chlorophenyl)-2′-(1-methylene-propyl)-2,3-dihydro-2,6′-dioxospiro[indole-3,3′-piperidine]-1-methoxyethyl trimethylsilane as a solid (Yield 350 mg).

Quelle