Reaktion #77532

Reaktionsgleichung

(2R)-2,3,8,9-tetrahydrofuro[3,2-f][1,4]benzodioxin-2-ylmethyl 4-methylbenzenesulfonate

2,3-dichloro-5,6-dicyano-1,4-benzoquinone

→

title compound

2,3-Dihydrofuro[3,2-f][1,4]benzodioxin-2-ylmethyl 4-Methylbenzenesulfonate

Lösungsmittel

benzene

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe solvent was removed in vacuum
2. 2
   Sonstigethe residue column chromatographed on silica gel with methylene chloride as eluant
3. 3
   Einengenconcentrated in vacuum

Vorschrift

A solution of 0.54 g (0.67 mmole) of (2R)-2,3,8,9-tetrahydrofuro[3,2-f][1,4]benzodioxin-2-ylmethyl 4-methylbenzenesulfonate and 0.46 g (2.0 mmole) of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone in 20 ml of benzene was refluxed under nitrogen for 15 hours. The solvent was removed in vacuum and the residue column chromatographed on silica gel with methylene chloride as eluant. The product fractions were combined and concentrated in vacuum to give 0.40g of the (R)-enantiomer of the of the title compound as a tan solid. 1H-NMR (CDCl3): doublet 7.8 δ (2H); doublet 7.52 δ (1H); doublet 7.3 δ (2H); doublet 6.95 δ (1H); doublet 6.8 δ (1H); doublet 6.65 δ (1H); multiplet 4.5 δ (1H); multiplet 4.25 δ (3H); doublet of doublets 4.1 δ (1H); singlet 2.4 δ (3H).

Quelle