Synthesis 2022; 54(17): 3809-3816
DOI: 10.1055/s-0040-1720028
special topic
Special Issue in memory of Prof. Ferenc Fülöp

Synthesis of Alicyclic 2-Methylenethiazolo[2,3-b]quinazolinone Derivatives via Base-Promoted Cascade Reactions

Mohamed El Haimer
a   Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellence Centre, Eötvös utca 6, Szeged 6720, Hungary
,
Tünde Faragó
a   Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellence Centre, Eötvös utca 6, Szeged 6720, Hungary
,
Zsuzsanna Schelz
b   Pharmacodynamics and Biopharmacy, University of Szeged, Interdisciplinary Excellence Centre, Eötvös utca 6, Szeged 6720, Hungary
,
István Zupkó
b   Pharmacodynamics and Biopharmacy, University of Szeged, Interdisciplinary Excellence Centre, Eötvös utca 6, Szeged 6720, Hungary
,
Márta Palkó
a   Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellence Centre, Eötvös utca 6, Szeged 6720, Hungary
› Author Affiliations
We are grateful to the Hungarian Scientific Research Fund (OTKA No. K 138871). Financial support from the University of Szeged (GINOP-2.3.2-15-2016-00038 project) and Ministry of Human Capacities, Hungary (20391-3/2018/FEKUSTRAT) is acknowledged.


Dedicated to the memory of Professor Ferenc Fülöp.

Abstract

The synthesis of alicyclic 2-methylenethiazolo[2,3-b]quinazo­l­inones is performed via base-promoted cascade reactions, starting from either alicyclic β-amino propargylamides using carbon disulfide, or from alicyclic ethyl 2-isothiocyanatocarboxylates by addition of propargylamine. In both cases the cascade reaction proceeds by way of a favoured 5-exo-dig process during the second ring closure, as confirmed by full NMR spectroscopic assignments. Moreover, a high-yielding retro­-Diels–Alder (RDA) reaction is performed on the norbornene derivatives leading to 2-methylene-2H-thiazolo[3,2-a]pyrimidin-5(3H)-ones. The obtained compounds exert modest antiproliferative activities against a panel of human gynaecological cancer cell lines.

Supporting Information



Publication History

Received: 15 October 2021

Accepted after revision: 29 October 2021

Article published online:
07 December 2021

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