Potassium Carbonate → 2-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzylsulfanyl]-benzofuran

HRID 915782Notes

Reaction equation

[S:1]1[CH:5]=[C:4]([C:6]2[CH:11]=[CH:10][CH:9]=[CH:8][C:7]=2[OH:12])N=N1.Br[CH2:14][C:15]1[CH:20]=[CH:19][C:18]([B:21]2[O:25][C:24]([CH3:27])([CH3:26])[C:23]([CH3:29])([CH3:28])[O:22]2)=[CH:17][CH:16]=1.C([O-])([O-])=O.[K+].[K+]>CC#N>[CH3:26][C:24]1([CH3:27])[C:23]([CH3:28])([CH3:29])[O:22][B:21]([C:18]2[CH:17]=[CH:16][C:15]([CH2:14][S:1][C:5]3[O:12][C:7]4[CH:8]=[CH:9][CH:10]=[CH:11][C:6]=4[CH:4]=3)=[CH:20][CH:19]=2)[O:25]1

Participants

Conditions

Temperature: 90 °C

Procedure

Starting material 2-[1,2,3]Thiadiazol-4-yl-phenol was prepared according to literature procedure (M. A. Abramov, W. Dehaen, B. D'hooge, M. L. Petrov, S. Smeets, S. Toppet and M. Voets Tetrahedron, 2000, 56, 3933–3940). 2-[1,2,3]Thiadiazol-4-yl-phenol (241 mg, 1.35 mmol), 2-(4-Bromomethyl-phenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (406 mg, 1.37 mmol, 1 eq), and K2CO3 (396 mg, 2.87 mmol, 1.9 eq) was mixed in 8 mL of CH3CN and heat to 90° C. under nitrogen atmosphere. After reaction was complete as monitored by TLC, the mixture was cool to room temperature and solvent evaporated. The resulting crude material was subject to column chromatography (20% EtOAc in hexane) to give 2-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzylsulfanyl]-benzofuran (198 mg) in 40% yield. NMR: G8475-125. 1H NMR (400 MHz, CHLOROFORM-D) δ ppm 1.3 (s, 12 H)4.1 (s, 2 H) 6.6 (d, J=1.0 Hz, 1 H) 7.2 (m, 4 H) 7.4 (d, J=7.8 Hz, 2 H) 7.7 (d, J=8.1 Hz, 2 H).

Workup

customwas prepared
customAfter reaction
temperaturethe mixture was cool to room temperature
customsolvent evaporated

Sources & evidence

ORD record: ord-ac2ba73dfe98401998601e91b7f281d1
Source dataset: uspto-grants-2007_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07268135B2

Reaction notes

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