2,6-Dibromopyridine → 6-Bromo-pyridine-2-carboxylic acid tert-butylamide

2,6-Dibromopyridine (40 g, 170 mmol) in THF (200 mL) was added dropwise over 1 hr to a cooled (−78 C) solution of n-butyllithium (2.0M in pentane, 85 mL, 170 mmol) in THF (100 mL) under a nitrogen atmosphere. The mixture was allowed to stir for an additional 15 min, then tert-butyl isocyanate was added dropwise over 5 min. The resulting reaction mixture was allowed to warm slowly to room temperature overnight before quenching with saturated ammonium chloride solution (200 mL) and extracting with ethyl acetate (2×100 mL). The combined organics were dried (MgSO4) and evaporated in vacuo to yield the cude product A466.1 (42.4 g) as a dark brown oil which was used immediately without further purification. HPLC YMC S-5 4.6×33 mm (2 min grad): retention time 1.76 min, M+H+=203.08

1. customThe resulting reaction mixture
2. custombefore quenching with saturated ammonium chloride solution (200 mL)
3. extractionextracting with ethyl acetate (2×100 mL)
4. dry with materialThe combined organics were dried (MgSO4)
5. customevaporated in vacuo
6. customto yield the cude product A466.1 (42.4 g) as a dark brown oil which
7. customwas used immediately without further purification
8. custom4.6×33 mm (2 min grad)

ORDレコード

ord-a2e006812d4b46bbbc5094eccf2321c1

出典データセット

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07737279B2