Reaktion #478472

Reaktionsgleichung

N-((5-bromopyridin-3-yl)(cyclopropyl)methyl)ethanesulfonamide

2-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzonitrile

sodium carbonate

CH2Cl2

→

title compound

Ausbeute 84.9%

N-((5-(3-chloro-4-cyanophenyl)pyridin-3-yl)(cyclopropyl)methyl)ethanesulfonamide

Ausbeute 84.9%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenAfter concentration
2. 2
   workup.DISSOLUTIONthe residue was dissolved into CH2Cl2
3. 3
   Filtrationfiltered through a pad of Na2SO4
4. 4
   SonstigeThe solution was absorbed into celite and
5. 5
   Einengenconcentrated
6. 6
   SonstigeThe residue was purified by flash column (ethyl acetate/heptane, 30%-50%-80%, v/v)

Vorschrift

A mixture of N-((5-bromopyridin-3-yl)(cyclopropyl)methyl)ethanesulfonamide (5 g, 15.66 mmol), 2-chloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzonitrile (as prepared in Example 1, step 1; 4.13 g, 15.66 mmol), sodium carbonate (15.66 mL, 31.3 mmol) and PdCl2 (dppf).CH2Cl2 adduct (0.320 g, 0.392 mmol) in DMF (100 mL) was heated to 100° C. for 25 min. After concentration, the residue was dissolved into CH2Cl2 and filtered through a pad of Na2SO4. The solution was absorbed into celite and concentrated. The residue was purified by flash column (ethyl acetate/heptane, 30%-50%-80%, v/v) and yielded the title compound as a colorless solid (5.0 g). Chiral separation by chiral HPLC (Chiralpak AD-H using Supercritical fluid chromatography. 25% Methanol at 65 grams per minute with supercritical CO2) afforded enantiomer 1 (S)—N-((5-(3-chloro-4-cyanophenyl)pyridin-3-yl)(cyclopropyl)methyl)ethanesulfonamide (retention time=3 min), and enantiomer 2 (R)—N-((5-(3-chloro-4-cyanophenyl)pyridin-3-yl)(cyclopropyl)methyl)ethanesulfonamide (retention time=4 min). ESI-MS m/z: 376.2 [M+H]+, 1H NMR (400 MHz, CDCl3): δ 0.37-0.40 (m, 1H), 0.51-0.55 (m, 1H), 0.57-0.68 (m, 1H), 0.70-0.77 (m, 1H), 1.15-1.27 (m, 3H), 2.70-2.88 (m, 2H), 3.85 (dd, J=5 Hz, 9 Hz, 1H), 4.68 (d, J=5 Hz, 1H), 7.53 (dd, J=1.5 Hz, 8 Hz, 1H), 7.67 (d, J=1.5 Hz, 1H), 7.73 (d, J=8 Hz, 1H), 7.80 (t, J=2 Hz, 1H), 8.67 (d, J=2 Hz, 1H), 8.72 (d, J=2 Hz, 1H).

Quelle