Schütznerová E, Přibylka A, Medran NS, Krchňák V. Greening Solid-Phase Organic Synthesis: Environmentally Conscious Synthesis of Pharmaceutically Relevant Privileged Structures 5,6-Dihydropyridin-2(1
H)-ones and Quinolin-2(1
H)-ones.
J Org Chem 2020;
85:11867-11881. [PMID:
32841557 DOI:
10.1021/acs.joc.0c01623]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Solid-phase organic synthesis (SPOS) is a very efficient methodology for the synthesis of diverse organic molecules, particularly exploited in drug discovery. Here, we present the transformation of the traditional SPOS to an eco-friendlier methodology on examples of pharmacologically relevant privileged structures 5,6-dihydropyridin-2(1H)-ones and quinolin-2(1H)-ones. The green approach is primarily based on the utilization of environmentally friendly solvent 2-MeTHF in all steps of the synthesis. Target heterocycles were synthesized by extending our previously published synthesis of five-membered tetramic acid analogues to six-membered cycles. The crucial step of the synthesis is cyclization via nonclassical Wittig olefination of resin-bound esters. Traditional and green protocols provided comparable results with respect to purity and yield of products, thus opening the way for greener access to a variety of diverse heterocycles.
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