Total synthesis of (±)-3-demethoxyerythratidinone via Tf2O-promoted cascade reaction of enaminone

Author:

Lou Mingliang1,Liu Xiaolei2,Han Shoule13,Bai Songlin14,Qi Xiangbing13ORCID

Affiliation:

1. National Institute of Biological Sciences (NIBS), Beijing 102206, China

2. Institute for Smart Materials & Engineering, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China

3. Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 100084, China

4. School of Life Sciences, Tsinghua University, Beijing 100084, China

Abstract

A 6-step synthesis of the Erythrina alkaloid 3-demethoxyerythratidinone was accomplished through a cascade reaction, featuring Tf2O-induced enaminone activation followed by a Pictet–Spengler reaction for the construction of fused and spiro rings.

Funder

National Natural Science Foundation of China

National Outstanding Youth Foundation of China

Tsinghua University

Publisher

Royal Society of Chemistry (RSC)

Reference49 articles.

1. S. F.Dyke and S. N.Quessy , in The Alkaloids , ed. R. R. G. A. , Academic , New York , 1981 , vol. 18, ch. 1, pp. 1–98

2. E.Reimann , in Progress in the Chemistry of Organic Natural Products , ed. W. Herz , H. Falk and G. W. Kirby , Springer , Vienna , 2007 , Vol. 88, ch. 1, pp. 1–62

3. An enantiospecific synthesis of (+)-demethoxyerythratidinone from (S)-malic acid: key observations concerning the diastereocontrol in malic acid-derived N-acyliminium ion cyclisations

4. New approaches for the synthesis of erythrinan alkaloids

5. Benzoquinone-derived sulfinyl imines as versatile intermediates for alkaloid synthesis: Total synthesis of (–)-3-demethoxyerythratidinone

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