Applications of chiral spirocyclic phosphoric acid in the synthesis of natural products

Abstract

With a 10 years development, chiral spirocyclic phosphoric acids (SPAs) have attracted a substantial amount of attention from the synthetic organic chemistry community. This kind of small molecule organic catalysts has some advantages like easy to obtain, no transition metal and wide application range. Because of avoiding the use of toxic substances which are limited in the process of drug synthesis, a large number of studies pay attention to the key structures (such as indole, carbozole.) containing pharmacological active components in natural products. And most of them get a excellent result in yields (more than 80% yield) and enantioselectivities (more than 90% ee). These studies can provide new pathways to nature products.