1,4-Dioxane → 4-(2-hydroxypropan-2-yl)-N-(7-(thiophen-3-yl)pyrazolo[1,5-a]pyrimidin-5-yl)benzamide

Participants

Reaction Conditions

Reaction Steps

A suspension of N-(7-chloropyrazolo[1,5-a]pyrimidin-5-yl)-4-(2-hydroxypropan-2-yl)benzamide (2D, 50 mg, 151 mmol), thiophen-3-ylboronic acid (64 mg, 302 mmol), and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (9 mg, 12 μmol) in 2:1 1,4-dioxane/saturated aqueous NaHCO3 (670 microliters of 1,4-dioxane and 330 microliters of saturated aqueous NaHCO3) was prepared in a 2 mL microwave reaction vessel and the sealed reaction vessel warmed to 110° C. for 20 minutes. The reaction mixture was cooled to rt, diluted with methanol, filtered, and purified via preparative HPLC, 40-70% (MeCN/H2O gradient+0.01% TFA). Lyophilization of the combined fractions gave the titled compound as a yellow solid (6.4 mg, 11%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.46 (s, 6H) 6.61 (d, 1H) 7.63 (d, J=8.34 Hz, 2H) 7.84 (dd, J=5.18, 2.91 Hz, 1H) 7.93 (dd, J=5.18, 1.14 Hz, 1H) 8.04 (d, J=8.34 Hz, 2H) 8.23-8.40 (m, 2H) 9.12 (dd, J=3.03, 1.26 Hz, 1H) 11.24 (s, 1H). ESI-MS: m/z 379.2 (M+H)+.

Provenance & Evidence