Phenylboronic Acid → 2'-amino-1'-methyl-2,6-diphenylspiro-[chroman-4,4'-imidazol]-5'(1'H)-one

HRID 1408613Notes

Reaction equation

[NH2:1][C:2]1[N:3]([CH3:24])[C:4](=[O:23])[C:5]2([C:15]3[C:10](=[CH:11][CH:12]=[C:13](Br)[CH:14]=3)[O:9][CH:8]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[CH2:7]2)[N:6]=1.[C:25]1(B(O)O)[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1>O1CCOCC1.C([O-])([O-])=O.[Cs+].[Cs+].Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[NH2:1][C:2]1[N:3]([CH3:24])[C:4](=[O:23])[C:5]2([C:15]3[C:10](=[CH:11][CH:12]=[C:13]([C:25]4[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=4)[CH:14]=3)[O:9][CH:8]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[CH2:7]2)[N:6]=1

Participants

Conditions

Temperature: 120 °C

Procedure

Pd(PPh3)2Cl2 (10 mg) in a 10 mL tube under Ar was treated sequentially with 2′-amino-6-bromo-1′-methyl-2-phenylspiro[chroman-4,4′-imidazol]-5′(1′H)-one (20 mg, 0.052 mmol) in 1,4-dioxane (1 mL), Cs2CO3 (2 N, 0.3 mL) and phenylboronic acid (16 mg, 0.1 mmol). The mixture was heated under microwave at 120° C. for 30 minutes. 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 2′-amino-1′-methyl-2,6-diphenylspiro-[chroman-4,4′-imidazol]-5′(1′H)-one (1.55 mg, 5%). 1H-NMR (MeOD): 2.42 (m, 1H), 2.61 (m, 1H), 3.27 (s, 3H), 5.83 (d, 1H), 7.10 (d, 1H), 7.29 (m, 1H), 7.40 (m, 5H), 7.59 (m, 5H).

Workup

concentrationThe reaction mixture was concentrated in vacuo
customto give the residue, which
customwas purified by preparative TLC

Sources & evidence

ORD record: ord-6c232130be984827b47903a0d1c4fef7
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08921359B2

Reaction notes

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