Reaktion #597450

Reaktionsgleichung

(S)-2-(2-bromo-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethyl pivalate

2-chloro-4-pyridinylboronic acid

potassium carbonate

→

final compound

(S)-2-tert-butoxy-2-(7-(4-chlorophenyl)-2-(2-chloropyridin-4-yl)-5-methylbenzo[d]thiazol-6-yl)ethyl pivalate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeflushed with argon three times
2. 2
   workup.ADDITIONTo this mixture was added
3. 3
   Sonstigedegassed 1,4-dioxane (3.5 mL) and water (0.7 mL)
4. 4
   Temperaturthen cooled to rt
5. 5
   SonstigeThe aqueous layer was separated
6. 6
   Extraktionextracted three times with ethyl acetate
7. 7
   Trocknendried over Na2SO4
8. 8
   Einengenconcentrated
9. 9
   SonstigePurification by flash column chromatography on silica gel (hexanes/ethyl acetate eluent)

Vorschrift

(S)-2-(2-bromo-7-(4-chlorophenyl)-5-methylbenzo[d]thiazol-6-yl)-2-tert-butoxyethyl pivalate (400.0 mg, 0.742 mmol), 2-chloro-4-pyridinylboronic acid (140.2 mg, 0.891 mmol), potassium carbonate (307.7 mg, 2.227 mmol), and Pd(PPh3)4 (128.7 mg, 0.111 mmol) were placed in a microwave vial and the vial was vacuum pumped and flushed with argon three times. To this mixture was added degassed 1,4-dioxane (3.5 mL) and water (0.7 mL). The reaction mixture was heated at 90° C. for 4.5 h then cooled to rt. The aqueous layer was separated and extracted three times with ethyl acetate. All organic layers were combined, dried over Na2SO4, and concentrated. Purification by flash column chromatography on silica gel (hexanes/ethyl acetate eluent) provided the final compound. LCMS-ESI+: calc'd for C30H33O2N2O3S: 571.2 (M+H+); Found: 571.1 (M+H+); 1H NMR (400 MHz, CDCl3) δ 8.49 (d, J=4.9 Hz, 1H), 7.93 (s, 2H), 7.77 (d, J=5.0 Hz, 1H), 7.55 (d, J=9.2 Hz, 1H), 7.50 (d, J=7.4 Hz, 1H), 7.40 (d, J=7.4 Hz, 1H), 7.29 (d, J=8.9 Hz, 1H), 4.82 (dd, J=8.9, 2.7 Hz, 1H), 4.42 (dd, J=11.2, 9.3 Hz, 1H), 4.29 (dd, J=11.5, 3.2 Hz, 1H), 2.80 (s, 3H), 1.14 (s, 9H), 0.97 (s, 9H).

Quelle