Reaktion #2149089

Reaktionsgleichung

4-Bromobenzothiophene

dichloromethyl methyl ether

NaHCO3

→

4-bromobenzothiophene-3-carboxaldehyde

Ausbeute 44.7%

Lösungsmittel

DCM

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionwas extracted with DCM (2×150 mL)
2. 2
   EinengenThe extracts were concentrated
3. 3
   Sonstigechromatographed (0 to 15% ethyl acetate in hexane)

Vorschrift

4-Bromobenzothiophene (1.80 g, 8.45 mmol) and dichloromethyl methyl ether (1.46 g, 12.7 mmol) were dissolved in anhydrous DCM (100 mL). Titanium tetrachloride (2.40 g, 12.7 mmol) was added, turning the solution dark. After 30 minutes at room temperature, the reaction was poured into a mixture of saturated aqueous NaHCO3 and ice. The mixture was stirred for about 30 minutes and then was extracted with DCM (2×150 mL). The extracts were concentrated and chromatographed (0 to 15% ethyl acetate in hexane) to yield 4-bromobenzothiophene-3-carboxaldehyde (0.910 g). The 4-bromobenzothiophene-3-carboxaldehyde (0.910 g, 3.77 mmol) and sulfamide (3.0 g, 31 mmol) were combined in anhydrous ethanol (25 mL) and heated to reflux for three days. The reaction was cooled to room temperature and sodium borohydride (0.157 g, 4.15 mmol) was added. After five hours, water (50 ml) was added and the solution was extracted with chloroform (3×50 mL). The extracts were concentrated, suspended in a minimal amount of DCM, and filtered to yield the title compound as a yellow solid.

Quelle