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Sokolnicki, Tomasz ; Stefanowska-K?tna, Kinga ; Czapik, Agnieszka , et al. Int. J. Mol. Sci.,2024,25(22):12208. DOI: 10.3390/ijms252212208
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Abstract: A novel approach towards synthesizing new metalloid-substituted olefins has been accomplished by transforming (E)-1,2-diboryl-1-silylethenes through two consecutive Suzuki–Miyaura coupling reactions. This methodology provides an effective and selective way to obtain new, structurally different products, such as (E)-1-silyl-1-boryl-2-arylethens, (1E,3E)-1-silyl-1-boryl-2-alkenylethens, and (E)-1-silyl-1-aryl1-2-aryl2ethenes, which are difficult to synthesize through hydrometallation reactions and related processes. Due to the presence of reactive motifs (silyl group, Bpin moiety, and Csp2-H bond) in the structure of the final products, these molecules might be considered powerful building blocks in modern chemistry. With the aid of demetallation and cross-coupling reactions, they might be further functionalized into several invaluable chemicals, i.e., tetrasubstituted olefins (anti-cancer drugs, fluorescence materials), compounds with high π-conjugation, and polymers.
Keywords: (E)-1-silyl-1,2-diboryl-ethenes ; aryl iodides ; (E)-(2-iodovinyl)benzenes ; Suzuki–Miyaura cross-coupling ; substituted olefins ; building blocks
Purchased from AmBeed: 696-62-8
CAS No. : | 696-62-8 | MDL No. : | MFCD00001056 |
Formula : | C7H7IO | Boiling Point : | - |
Linear Structure Formula : | CH3O(C6H4I) | InChI Key : | SYSZENVIJHPFNL-UHFFFAOYSA-N |
M.W : | 234.03 | Pubchem ID : | 69676 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80% | Stage #1: With 2,2,6,6-tetramethylpiperidinyl-lithium In toluene at 20℃; for 0.25 h; Glovebox Stage #2: With palladium(l) tri-tert-butylphosphine iodide dimer In toluene at 20℃; Glovebox |
General procedure: Inside the glovebox, lithium 2,2,6,6-tetramethylpiperidide (LiTMP, 70.7 mg, 0.48 mmol, 1.2 eq.) was dissolved in toluene (1.5 mL) and carbonyl compound (3, 0.48 mmol, 1.2 eq.) was added. After 15 min of stirring at ambient temperature a solution of Pd(I) iodo dimer (2, 3.5 mg, 0.004 mmol, 1 molpercent for aryl iodides; 17.4 mg, 0.02 mmol, 5 molpercent for aryl bromides) and aryl halide (4, X = I or Br, 0.4 mmol, 1.0 eq.) in toluene (0.5 mL) was added. After 4-18 h of further stirring at ambient temperature (reaction progress was monitored by GCMS), the crude was directly adsorbed onto silica (washing with diethyl ether) and purified by flash column chromatography. |