Synlett 2019; 30(06): 665-673
DOI: 10.1055/s-0037-1609660
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© Georg Thieme Verlag Stuttgart · New York

Synthesis of Chlorinated Arenes and Hetarenes by One-Pot Cyclizations of 1,3-Bis-silyl Enol Ethers

Zahid Hassan
a   Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany   Email: zhassanhej@yahoo.com   Email: peter.langer@uni-rostock.de
b   Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
,
Peter Langer*
a   Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany   Email: zhassanhej@yahoo.com   Email: peter.langer@uni-rostock.de
b   Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany
› Author Affiliations
Financial support by the Higher Education Commission of Pakistan (HEC) and DAAD is gratefully acknowledged.
Further Information

Publication History

Received: 30 August 2018

Accepted after revision: 05 May 2018

Publication Date:
04 January 2019 (online)


In memory of our colleague and friend Muhammad Zeeshan.

Abstract

This account describes our recent findings and progress in synthesizing chlorinated arenes and hetarenes by one-pot cyclizations of 1,3-bis-silyl enol ether derivatives. These reactions allow for the preparation of highly functionalized products with a high level of regioselectivity. The synthetic routes are cost-effective avoiding additional functionalization steps. The products are difficult to be accessed by other methods. The chlorine atom is of relevance in medicinal and agriculture chemistry. In addition, it allows further functionalizations by transition-metal-catalyzed cross-coupling reactions.

1 Introduction

2 Cyclizations of 2-Chloro-1,3-bis(silyloxy)-1,3-butadienes

2.1 3,5-Dihydroxychlorophthalates

2.2 2,4-Dihydroxy-homochlorophthalates

2.3 2-(Arylsulfonyl)chloropyridines

2.4 1-Azaxanthones

3 Cyclizations of 4-Chloro-1,3-bis(trimethylsilyloxy)-1,3-butadienes

3.1 3-Chlorosalicylates

3.2 Functionalized Chlorobiaryls

3.3 3-Chloro-5-(2-chloroethyl)-salicylates

3.4 2,4-Dihydroxychlorobenzophenones

4 Cyclizations of 2-Chloro-3-(silyloxy)-2-en-1-ones

4.1 Functionalized Chlorophenols

4.2 Functionalized Chlorinated Biaryls and Chlorofluorenones

4.3 Functionalized Chlorochromenones

4.4 Functionalized 3-(Methylthio)chlorophenols

4.5 Functionalized 3-Chloromethylphenols

5 Conclusions

6 List of Abbreviations