Synlett 2021; 32(12): 1157-1168
DOI: 10.1055/s-0040-1706009
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(4+1)-Cycloadditions Exploiting the Biphilicity of Oxyphosphonium Enolates and RhII/PdII-Stabilized Metallocarbenes for the Construction of Five-Membered Frameworks

Zachary D. Tucker
,
Brandon L. Ashfeld
This work was supported by the National Science Foundation (Division of Chemistry, CHE-1665440, 1956170; Division of Chemical, Bioengineering, Environmental, and Transport Systems, CBET-2031431).


Abstract

(4+1)-Cyclizations are an underutilized disconnect for the formation of five-membered heterocyclic and carbocyclic frameworks. Herein we analyze methods employing oxyphosphonium enolates and RhII/PdII-metallocarbenes as C1 synthons in the presence of several four-atom components for the synthesis of 2,3-dihydrobenzofurans, 2,3-dihydroindoles, oxazolones, cyclopentenones, and pyrrolones.

1 Introduction

2 (4+1)-Cyclizations Employing Kukhtin–Ramirez-Like Reactivity

3 (4+1)-Cyclizations Employing a Cyclopropanation/Ring-Expansion Sequence

4 Pd-Catalyzed (4+1)-Cyclizations through Carbene Migratory Insertion/Reductive Elimination Processes

5 Summary



Publication History

Received: 01 October 2020

Accepted after revision: 28 October 2020

Article published online:
26 January 2021

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