Iodine → HCID 54064757, compound

Temperature

9.5 °C

A solution of (2R)-2-(formylamino)-3-(2-thienyl)propionic acid (3.58 g, 18.0 mmol) in tetrahydrofuran (50 ml) was added dropwise to a suspension of sodium borohydride in tetrahydrofuran (50 ml), which was cooled to 7-12° C. (inside temperature). After the addition was finished, a solution of iodine (4.57 g, 18.0 mmol) in tetrahydrofuran (100 ml) was added dropwise. The reaction mixture was heated to reflux for 16 h. It was cooled to 0° C. Methanol (200 ml) was added dropwise. The solvent was removed in vacuo. The residue was dissolved in a freshly prepared 20% aqueous sodium hydroxide solution (200 ml). The aqueous phase was extracted with tert-butyl methyl ether (4×150 ml). The combined organic layers were dried over magnesium sulfate. The solvent was removed in vacuo to give 3.26 g of crude (2R)-2-methylamino-3-(2-thienyl)propan-1-ol, which was used for the following step.

1. additionAfter the addition
2. temperatureThe reaction mixture was heated
3. temperatureto reflux for 16 h
4. temperatureIt was cooled to 0° C
5. customThe solvent was removed in vacuo
6. dissolutionThe residue was dissolved in a freshly prepared 20% aqueous sodium hydroxide solution (200 ml)
7. extractionThe aqueous phase was extracted with tert-butyl methyl ether (4×150 ml)
8. dry with materialThe combined organic layers were dried over magnesium sulfate
9. customThe solvent was removed in vacuo

ORD record

ord-51728bd79497439aabe0fa3011f9a90e

Source dataset

uspto-grants-2000_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06127391