New Jobs:

- Assoc RS (Exelixis)

- Org/Med Chemist (Flavine)

- Process Chemist (Avista)

- Sr Chemist (Laxmi)

Latest Internships:

- Theravance

  (Medicinal Chemistry)

- Cepheid

  (Chemistry)



Nitro Reduction

(SnCl2)







Examples:


Example 1



To a solution of the SM (10.9 g, 27.7 mmol) in EtOAc (100 mL) was added SnCl2-2H2O (18.7 g, 83.1 mmol). The reaction mixture was stirred at 50 C overnight. The mixture was filtered through celite, and the filtrate was washed with 10% NaHCO3. The layers were separated and the aq layer was further extracted with EtOAc. The combined organics were dried and concentrated in vacuo to provide the product as a brown solid. [9.5 g, 95%]


[Patent Reference: WO2002016361, page 35, (2.1 MB)]



Example 2



To a solution of the SM (700 mg, 2.81 mmol) in EtOH (5 mL) was added SnCl2 (2.8 g, 14.7 mmol) at 0 C. The resulting mixture was stirred at RT for 10 min, then reflux for 4 h. After completion of the reaction, ice-cold H2O was added to the reaction mixture. The residue obtained was diluted with 20% NaOH and the aq layer was extracted with EtOAc. The org layer was dried (Na2SO4) and concentrated to provide the product as a brown oily liquid. [560 mg, 91%]


[Patent Reference: WO2014149164, page 375, (23.7 MB)]