Volume 133, Issue 41 pp. 22410-22414
Zuschrift

Catalytic Asymmetric Darzens-Type Epoxidation of Diazoesters: Highly Enantioselective Synthesis of Trisubstituted Epoxides

Dong Guk Nam

Dong Guk Nam

Department of Chemistry, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 16419 Korea

These authors contributed equally to this work.

Search for more papers by this author
Dr. Su Yong Shim

Dr. Su Yong Shim

Department of Chemistry, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 16419 Korea

Present address: Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037 USA

These authors contributed equally to this work.

Search for more papers by this author
Hye-Min Jeong

Hye-Min Jeong

Department of Chemistry, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 16419 Korea

Search for more papers by this author
Dr. Do Hyun Ryu

Corresponding Author

Dr. Do Hyun Ryu

Department of Chemistry, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 16419 Korea

Search for more papers by this author
First published: 04 August 2021
Citations: 2

Abstract

Highly enantioselective Darzens-type epoxidation of diazoesters with glyoxal derivatives was accomplished using a chiral boron–Lewis acid catalyst, which facilitated asymmetric synthesis of trisubstituted α,β-epoxy esters. In the presence of a chiral oxazaborolidinium ion catalyst, the reaction proceeded in high yield (up to 99 %) with excellent enantio- and diastereoselectivity (up to >99 % ee and >20:1 dr, respectively). The synthetic potential of this method was illustrated by conversion of the products to various compounds such as epoxy γ-butyrolactone, tertiary β-hydroxy ketone and epoxy diester.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.