A method for preparing gem-diboron compounds by selective 1,1-diboration of alkenes

A compound and selective technology, applied in the field of selective 1,1-diboronation of olefins to prepare geminal diboron compounds, can solve the problems of reduced atom economy, limited substrate source, poor compatibility of functional groups, etc. Product separation and purification, improved atom economy, mild reaction conditions

Active Publication Date: 2021-12-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above synthesis methods still have disadvantages such as low atom economy, poor functional group compatibility, limited substrate sources, high reaction costs, and the need for noble metals and complex ligands.
However, the known direct preparation of gem-diboron compounds from simple and abundant alkenes requires additional hydrogen acceptors and expensive double-linked pinacol-based diboranes, which reduces the atom economy of the reaction.

Method used

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  • A method for preparing gem-diboron compounds by selective 1,1-diboration of alkenes
  • A method for preparing gem-diboron compounds by selective 1,1-diboration of alkenes
  • A method for preparing gem-diboron compounds by selective 1,1-diboration of alkenes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 A method for the selective 1,1-diboration of olefins to prepare gem-diboron compounds:

[0023]

[0024] Add Cp to the reaction tube sequentially 2 ZrCl 2 (0.01 mmol, 2.9 mg), MeOLi (0.2 mmol, 7.6 mg), toluene (1 mL), pinacol borane 2a (0.6 mmol, 87 μL), styrene 1a (0.2 mmol, 23 μL), in nitrogen (1atm ) atmosphere at 100 °C for 8 h with stirring. GC-MS detection yield was 88%.

Embodiment 2

[0025] Example 2 A method for the selective 1,1-diboration of olefins to prepare gem-diboron compounds:

[0026]

[0027] Add Cp to the reaction tube sequentially 2 ZrCl 2 (0.01 mmol, 2.9 mg), MeOLi (0.2 mmol, 7.6 mg), toluene (1 mL), pinacol borane 2a (0.6 mmol, 87 μL), styrene 1a (0.2 mmol, 23 μL), in nitrogen (1atm ) atmosphere at 130 °C for 2 h with stirring. GC-MS detection yield was 92%.

Embodiment 3

[0028] Example 3 A method for the selective 1,1-diboration of olefins to prepare gem-diboron compounds:

[0029]

[0030] Add Cp to the reaction tube sequentially 2 ZrCl 2 (0.01 mmol, 2.9 mg), MeOLi (0.2 mmol, 7.6 mg), toluene (1 mL), pinacol borane 2a (0.6 mmol, 87 μL), styrene 1a (0.2 mmol, 23 μL), in nitrogen (1atm ) atmosphere at 80 °C for 16 h with stirring. GC-MS detection yield was 81%.

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Abstract

The invention relates to a method for preparing gem-diboron compounds by selective 1,1-diboration of olefins. The method refers to: dissolving olefin compounds, metallocene-based transition metal catalysts and base compounds in a solvent, and then adding Borane compounds react in a protective atmosphere at 60-150°C for 1-16 h, and then separate to obtain gem-diboron compounds. The invention has the advantages of simple and convenient operation, low cost, high atomic economy of reaction, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of organic synthesis and transition metal catalysis, in particular to a method for preparing gem-diboron compounds by selective 1,1-diboration of alkenes. Background technique [0002] As an important intermediate in synthetic chemistry, organoboron compounds are widely used in research fields such as material science and pharmaceutical industry. In recent years, more and more chemists have paid more and more attention to the synthesis and application of polyboron compounds, in which gem-diboron compounds refer to organoboron compounds with two boron units connected on the same carbon. Because it contains two boron units, it means that it has more reaction sites, which also provides more transformation pathways and methods for the construction of complex molecules, and is a very useful synthetic intermediate and pharmaceutical precursor compound. [0003] In view of the potential application value of gem-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F5/02
CPCC07F5/025
Inventor 吴立朋王先津崔鑫李思达王玥
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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