Tributyltin Chloride → 2-((Tert-butyldimethylsilyloxy)methyl)-5-(tributylstannyl)thiazole

Temperature

-78 °C

2-((tert-butyldimethylsilyloxy)methyl)thiazole (8.0 g, 35 mmol) was dissolved in dry THF (350 mL) and the solution was cooled to −78° C. To this solution, t-BuLi (1.7 M, 25 mL, 42 mmol) was added dropwise. The reaction was warmed to −40° C. and stirred for 2 hours. Then, Bu3SnCl (14.6 g, 45 mmol) was added and the resulting mixture was allowed to warm to room temperature slowly and stirred for another 30 min. NH4Cl (aq.) was added to quench the reaction and extracted with EtOAc. The organics was dried and concentrated. The residue was purified with column (silica gel, 0˜30 EtOAc/hexane) to give the product 2-((tert-butyldimethylsilyloxy)methyl)-5-(tributylstannyl)thiazole (14.1 g)

1. temperatureThe reaction was warmed to −40° C.
2. temperatureto warm to room temperature slowly
3. stirringstirred for another 30 min
4. customto quench
5. customthe reaction
6. extractionextracted with EtOAc
7. customThe organics was dried
8. concentrationconcentrated
9. customThe residue was purified with column (silica gel, 0˜30 EtOAc/hexane)

ORD record

ord-481e3b87cacc44ddbbcc93050697583b

Source dataset

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09227971B2