Synthesis 2022; 54(04): 1081-1090
DOI: 10.1055/a-1671-8497
special topic
Cycloadditions – Established and Novel Trends – in Celebration of the 70th Anniversary of the Nobel Prize Awarded to Otto Diels and Kurt Alder

Tandem Nickel-Catalyzed Dimerization/(4+2) Cycloaddition of Terminal Alkynes with Four-Membered Ring Ketones

Manuel Barday
,
Eva Nicolas
,
Bradley Higginson
,
François Delmotte
,
Martin Appelmans
,
We thank the University of Liverpool (studentship to M.B.) for financial support.


Abstract

Controlling the behavior of terminal alkynes in metal-catalyzed intermolecular tandem reactions is a formidable challenge despite the potential advantage offered by these strategies in modern synthesis. Herein, we describe that a nickel catalyst enables a tandem process involving the rapid dimerization of terminal alkynes into 1,3-enynes and the cycloaddition of these intermediates with an azetidinone, an oxetanone or benzocyclobutenones. Significantly, the slow or sequential addition of reagents and catalysts is not required to orchestrate their reactivity. These results are in stark contrast with previous cycloadditions of terminal alkynes with strained four-membered ring substrates, which previously led to oligomerization or cyclotrimerization, except in the case of tert-butylacetylene.

Supporting Information



Publication History

Received: 20 September 2021

Accepted after revision: 18 October 2021

Accepted Manuscript online:
18 October 2021

Article published online:
22 November 2021

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