Reaktion #2468

Reaktionsgleichung

3-oxo-2-pentyl-1-cyclopentene-1-acetic acid

CH2Cl2

triethylamine

→

(+)-(1R)-cis-3-oxo-2-pentyl-1-cyclopentaneacetic acid

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeInto a Schlenk type vessel, kept anhydrous and under Ar, there
2. 2
   Filtrationthe orange soltion was filtered through a single use
3. 3
   Filtrationfilter (Acrodisc 0.45 μm) in a dry autoclave (100 ml/107Pa) under Ar
4. 4
   Waschenrinsed 5× with hydrogen at a pressure of 106Pa
5. 5
   workup.STIRRINGStirring at this pressure and 25°
6. 6
   workup.WAITwas carried out during 120 h
7. 7
   Einengenthe orange solution concentrated

Vorschrift

Into a Schlenk type vessel, kept anhydrous and under Ar, there was injected the precatalytic solution (6.75 ml) containing 47 mg (0.05 mmole) of bis(trifluoro-acetato)[(+)-(R)-2,2'-bis-(diphenylphosphino)-1,1'-binaphthyl]ruthenium (II), 3-oxo-2-pentyl-1-cyclopentene-1-acetic acid (0.5 g, 2.4 mmole), CH2Cl2 (5 ml), methanol (5 ml) and triethylamine (10.28 mg, 0.1 mmole, 14 μl, dist. over KOH). After stirring for 5 min, the orange soltion was filtered through a single use filter (Acrodisc 0.45 μm) in a dry autoclave (100 ml/107Pa) under Ar. The autoclave was then connected to a source of hydrogen and rinsed 5× with hydrogen at a pressure of 106Pa. The autoclave was then pressurized at 9×106Pa. Stirring at this pressure and 25° was carried out during 120 h. Afterwards, the pressure was gently released, the autoclave opened and the orange solution concentrated.

Quelle