Lipase-Catalyzed Enantiomer Separation of 3-Hydroxy-4-(tosyloxy)butanenitrile: Synthesis of (R)-GABOB (=(3R)-4-Amino-3-hydroxybutanoic Acid) and (R)-Carnitine Hydrochloride (=(2R)-3-Carboxy-2-hydroxy-N,N,N-trimethylpropan-1-aminium Chloride)

Synthetic Applications of Prins Cyclization in Natural Product Syntheses

The natural products having tetrahydropyran unit with multiple chiral centers serve as magnificent building blocks for various active pharmaceutical ingredients (APIs). 'Prins cyclization is one of the wonderful strategies to construct tetrahydropyran unit stereoselectively in asymmetric synthesis. In this account, we discuss our research efforts toward the synthesis of various natural products from the past two decades (2005-2020) by using Prins cyclization as a key step. Further, the synthetic utility of this reaction was investigated and well demonstrated on various molecules successfully.