Synthesis 2021; 53(12): 2057-2066
DOI: 10.1055/a-1370-1884
paper

Ultrasound-Promoted Synthesis of Spirocyclopropanes from Switchable Starting Materials via Azomethine Ylide [3+2]-Cycloaddition

Issa Yavari
a   Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran
,
Sara Sheikhi
a   Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran
,
Jamil Sheykhahmadi
a   Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran
,
Zohreh Taheri
a   Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran
,
Mohammad Reza Halvagar
b   Department of Inorganic Chemistry, Chemistry and Chemical Engineering Research Center of Iran, PO Box 14335-186, Tehran, Iran
› Author Affiliations
We are grateful to the Research Council of Tarbiat Modares University for support of this work.


Abstract

An ultrasound-promoted green protocol to access a new series of spirocyclopropanes from indeno[1,2-b]quinoxaline derivatives and azomethine ylides, generated in situ from the iodine-catalyzed reaction of acetophenones as well as of 2-methylquinoline with pyridine in the presence of a base, is described. These transformations proceed via a spirocyclopropanation reaction followed by elimination of pyridine. Clear evidence for the structure of a spirocyclopropane-linked indenoquinoxaline derivative was obtained from single-crystal X-ray analysis. The most important feature of this reaction is the fact it forms three stereogenic centers, one of which is quaternary, with excellent selectivity.

Supporting Information



Publication History

Received: 30 July 2020

Accepted after revision: 22 January 2021

Accepted Manuscript online:
22 January 2021

Article published online:
15 February 2021

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