3-Cyanophenylboronic acid → 3-(3'-amino-2'-methyl-2-(tetrahydro-2H-pyran-3-yl)-2'H-spiro[chroman-4,5'-[1,2,4]oxadiazole]-6-yl)benzonitrile

Participants

Reaction Conditions

Reaction Steps

Pd(PPh3)2Cl2 (10 mg) in a 10 mL tube under Ar was treated sequentially with 6-bromo-2′-methyl-2-(tetrahydro-2H-pyran-3-yl)-2′H-spiro[chroman-4,5′-[1,2,4]oxadiazol]-3′-amine (40 mg, 0.1 mmol) in 1,4-dioxane (2 mL), Cs2CO3 (2 N, 0.4 mL) and 3-cyanophenylboronic acid (31 mg, 0.2 mmol). The mixture was heated in a microwave reactor at 120° C. for 30 min. The reaction mixture was concentrated in vacuo to give the residue, which was purified by preparative TLC and then by preparative HPLC to give pure 3-(3′-amino-2′-methyl-2-(tetrahydro-2H-pyran-3-yl)-2′H-spiro[chroman-4,5′-[1,2,4]oxadiazole]-6-yl)benzonitrile (5 mg, 10%). 1H-NMR (MeOD): 1.69 (m, 2.5H), 2.01 (m, 3H), 2.51 (m, 1H), 2.72 (m, 1H), 3.42 (d, 2H), 3.52 (m, 3H), 3.90 (m, 2H), 4.15 (m, 1.5H), 7.02 (d, 1H), 7.59 (t, 1H), 7.68 (m, 2H), 7.94 (m, 3H).

Provenance & Evidence