Brønsted acid-catalyzed dynamic kinetic resolution of in situ formed acyclic N,O-hemiaminals: cascade synthesis of chiral cyclic N,O-aminals

Literature Information

Publication Date 2021-09-16
DOI 10.1039/D1QO01135A
Impact Factor 5.281
Authors

Xue-Jiao Lv, Yong-Chao Ming, Hui-Chun Wu


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Abstract

A Brønsted acid-catalyzed cascade acyclic N,O-hemiaminal formation/oxa-Michael reaction is developed for the synthesis of cis-2,6-disubstituted tetrahydropyrans bearing an exo amide group, that is, cyclic N,O-aminals. By using TsOH, various different amides including carboxyamides, carbamates, sulfonamides and even phosphoramides were applicable for the designed reaction sequence. By using chiral phosphoric acid, a wide range of enantioenriched cyclic N,O-aminal scaffolds were obtained. Detailed mechanistic investigations revealed that the good enantioselectivity can be attributed to a H2O controlled dynamic kinetic resolution of the in situ formed acyclic N,O-hemiaminal intermediate during the reaction process. Furthermore, a number of divergent transformations of the obtained products were investigated, leading to various synthetically useful heterocyclic architectures.

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