Recent Developments and Applications of the Chiral BrOnsted Acid Catalyzed Allylboration of Carbonyl Compounds

The 50-year-old allylboration reaction has seen dramatic developments since the dawn of the new century after the first catalytic asymmetric versions came into play. In the past decade alone, several methodologies capable of achieving the desired homoallylic alcohols in over 90% ee have been developed. This review focuses on the chiral BrOnsted acid catalyzed allylboration reaction, covering everything from the very first examples and precedents to modern day variations and applications.