Reaktion #79927

Reaktionsgleichung

6-(2,2-dibromo-vinyl)-2-cyclopropyl-4,4-dimethyl-1,2,3,4-tetrahydroisoquinoline-6-carboxaldehyde

Intermediate 26

6-(2,2-dibromo-vinyl)-2-cyclopropyl-4,4-dimethyl-1,2,3,4-tetrahydroisoquinoline-6-carboxaldehyde

n-butyl lithium

→

title compound

Ausbeute 94.4%

2-Cyclopropyl-6-ethynyl-4,4-dimethyl-1,2,3,4-tetrahydroisoquinoline

Ausbeute 94.4%

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigequenched with saturated aqueous ammonium chloride solution
2. 2
   Extraktionextracted with diethyl ether (×2)
3. 3
   TrocknenThe combined organic phase was dried over anhydrous magnesium sulfate
4. 4
   Filtrationfiltered
5. 5
   Sonstigeevaporated in vacuo

Vorschrift

A stirred, cooled (−78° C.) solution of 6-(2,2-dibromo-vinyl)-2-cyclopropyl-4,4-dimethyl-1,2,3,4-tetrahydroisoquinoline-6-carboxaldehyde (Intermediate 26, 0.18 g, 0.47 mmol) in tetrahydrofuran (2 mL) was treated with 1.6M solution of n-butyl lithium (0.6 mL, 0.96 mmol) under argon. The reaction mixture was allowed to warm to −20° C. over 1.5 h, quenched with saturated aqueous ammonium chloride solution and extracted with diethyl ether (×2). The combined organic phase was dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo to afford the title compound as an oil (0.1 g, 94%).

Quelle