Methanol → Benzo[b]thiophen-4-ylmethanol

Temperatur

110 °C

To a solution (400 ml) of 4,5,6,7-tetrahydrobenzo(b)thiophen-4-one (70.0 g) in methanol was added dropwise a solution (200 ml) of bromine (75.0 g) in methanol at room temperature. After the completion of the reaction, the reaction mixture was poured into water and extracted with chloroform, and the solvent was evaporated under reduced pressure. The obtained residue was dissolved in DMF (500 ml) and lithium bromide (30.0 g) was added. The reaction mixture was stirred with heating at a reaction temperature of 110° C. for 1 hr. The reaction mixture was poured into ice water, extracted with chloroform, the extract was dried over magnesium sulfate and concentrated under reduced pressure to give 4-hydroxymethylbenzo(b)thiophene (50.5 g). This was dissolved in DMF (300 ml) and boron hydride (15.0 g) was added. The mixture was stirred at room temperature for 1 hr. To this reaction mixture was added dropwise methoxymethyl chloride (16.5 g). After the completion of the reaction, the reaction mixture was poured into water and extracted with ethyl acetate. The organic layer was dried and concentrated under reduced pressure. The residue was dissolved in THF (400 ml) and n-BuLi (1.6M hexane solution) (250 ml) was added dropwise at −78° C. After the mixture was stirred for 30 min, and carbonic acid gas was blown in until the reaction ended. The reaction mixture was poured into water, and the aqueous layer was made acidic with hydrochloric acid, and after extraction with ethyl acetate, the solvent was evaporated under reduced pressure to give the title compound as white crystals, melting point 212-214° C.

1. customAfter the completion of the reaction
2. extractionextracted with chloroform
3. customthe solvent was evaporated under reduced pressure
4. dissolutionThe obtained residue was dissolved in DMF (500 ml)
5. additionlithium bromide (30.0 g) was added
6. additionThe reaction mixture was poured into ice water
7. extractionextracted with chloroform
8. dry with materialthe extract was dried over magnesium sulfate
9. concentrationconcentrated under reduced pressure

ORD-Eintrag

ord-3f38f8b937a14f169f90e4fddde9efe8

Quelldatensatz

uspto-grants-2004_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06720320B2