Abstract
Brønsted acid catalysis has received considerable attention in modern organic synthesis. However, the utility of these Brønsted acid catalysts are somewhat limited toward applicable substrates due to its relatively lower reactivities of these Brønsted acids. With these perspectives, it is highly desirable to develop Brønsted acids demonstrating both high reactivities and selectivities. In this feature article, we will describe our achievement in the design and development of Lewis acid assisted Brønsted acid catalysts (LBA), Brønsted acid assisted Brønsted acid catalysts (BBA), strong Brønsted acid catalysts, and their applications.
