Triphenylphosphine → 3-(Bromomethyl)-1-methyl-1H-indazole

Temperatur

0 °C

To a stirring solution of 692 mg (2.64 mmol, 1.3 equiv) of triphenylphosphine in 10 mL of acetonitrile at 0° C. is added 125 μL (2.44 mmol, 1.2 equiv) of Br2. The resulting orange-yellow suspension is stirred 10 min at 0° C., then a solution of 330 mg (2.03 mmol) of (1-Methyl-1H-indazol-3-yl) methanol, prepared as in Intermediate 24, in 5 mL of acetonitrile is added over 2 min. The resulting solution is stirred 1.5 h at RT, and the solvent is removed in vacuo. Purification of the residue by silica gel flash column chromatography using hexane/EtOAc 5/1 as eluent afforded 185 mg of the title compound as a yellow solid: 1H NMR (CDCl3, 300 MHz) δ7.82 (d, 1H), 7.40 (m, 2H), 7.22 (m, 1H), 4.82 (s, 2H), 4.03 (s, 3H); Rf =0.87 in hexane/EtOAc 1/1.

1. stirringThe resulting solution is stirred 1.5 h at RT
2. customthe solvent is removed in vacuo
3. customPurification of the residue by silica gel flash column chromatography

ORD-Eintrag

ord-d14024e991324864af5109e900a8399e

Quelldatensatz

uspto-grants-1999_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05859007