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Synthesis of N-BOH Benzazaborines via a Modular GBB-Based Strategy.
Yi-Ming Chen1, Tian Tan2,3, Shi-Yu Xue1
1College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, Chongqing 402160, China.
A green one-pot reaction efficiently synthesizes N-BOH benzazaborines. This scalable method offers a sustainable route to valuable boron-nitrogen scaffolds for drug discovery.
Area of Science:
- Organic synthesis
- Medicinal chemistry
- Green chemistry
Background:
- Boron-nitrogen scaffolds are crucial in medicinal chemistry.
- Efficient and sustainable synthetic methods are needed.
Purpose of the Study:
- To develop a green, one-pot synthesis for N-BOH benzazaborines.
- To provide rapid access to boron-nitrogen scaffolds.
Main Methods:
- Utilized the Groebke-Blackburn-Bienaymé reaction.
- Employed a one-pot procedure in methanol.
- Purification via simple filtration.
Main Results:
- Successfully synthesized N-BOH benzazaborines.
- Products precipitated directly from methanol.
- Achieved purification without chromatography.
Conclusions:
- The developed method is efficient, scalable, and environmentally sustainable.
- Offers a simplified approach to boron-nitrogen scaffolds.
- Facilitates medicinal chemistry applications.
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Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
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