Synlett 2021; 32(09): 901-904
DOI: 10.1055/a-1385-2385
letter

(3+2)-Cycloaddition of Donor–Acceptor Cyclopropanes with Thiocyanate: A Facile and Efficient Synthesis of 2-Amino-4,5-dihydrothiophenes

Anu Jacob
a   Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
,
Philip Barkawitz
a   Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
,
Ivan A. Andreev
b   Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Samory Mashela 1, 117997 Moscow, Russian Federation
c   N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, 119991 Moscow, Russian Federation
,
Nina K. Ratmanova
b   Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Samory Mashela 1, 117997 Moscow, Russian Federation
,
Igor V. Trushkov
b   Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Samory Mashela 1, 117997 Moscow, Russian Federation
c   N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, 119991 Moscow, Russian Federation
,
Daniel B. Werz
a   Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106 Braunschweig, Germany
› Author Affiliations
A DAAD fellowship to A.J. is gratefully acknowledged.


Abstract

An easy and efficient route to obtain 2-amino-4,5-dihydrothiophenes is presented. A formal (3+2)-cycloaddition of donor–acceptor cyclopropanes and ammonium thiocyanate catalyzed by Yb(OTf)3 delivers the desired products in good to excellent yields. A broad range of functional groups is tolerated during this process.

Supporting Information



Publication History

Received: 21 January 2021

Accepted after revision: 07 February 2021

Accepted Manuscript online:
07 February 2021

Article published online:
05 March 2021

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