An Aryne-Based Route to Substituted Benzoisothiazoles

Area of Science:

• Organic Chemistry
• Heterocyclic Chemistry
• Synthetic Methodology

Background:

• Arynes are highly reactive intermediates crucial in organic synthesis.
• Benzo[d]isothiazoles are a significant class of heterocyclic compounds with diverse applications.
• Developing efficient and selective methods for synthesizing substituted benzo[d]isothiazoles is an ongoing challenge.

Purpose of the Study:

• To develop a novel synthetic route for 3-amino-substituted benzo[d]isothiazoles.
• To explore the scope and limitations of the reaction using various aryne precursors and thiadiazole derivatives.
• To achieve high yields and selectivity in the formation of the target heterocycles.

Main Methods:

• Generation of arynes in situ from 2-(trimethylsilyl)aryl triflates using fluoride ions.
• Reaction of the generated arynes with 3-hydroxy-4-aminothiadiazoles.
• Purification and characterization of the resulting 3-amino-substituted benzo[d]isothiazoles using standard spectroscopic techniques.

Main Results:

• The reaction selectively afforded 3-amino-substituted benzo[d]isothiazoles.
• The substitution patterns of both the aryne precursor and the thiadiazole could be varied.
• The target heterocycles were obtained in good to excellent yields.
• The amino substituent from the 3-hydroxy-4-aminothiadiazole was consistently incorporated into the product.

Conclusions:

• A novel and efficient method for synthesizing 3-amino-substituted benzo[d]isothiazoles has been established.
• The methodology offers versatility in accessing a range of substituted benzo[d]isothiazole derivatives.
• This approach provides a valuable tool for the synthesis of potentially bioactive heterocyclic compounds.