Results 21 to 30 of about 3,431 (233)
Journal of Saudi Chemical Society, 2016 In this paper, we describe a two-step synthesis of a series of substituted tetrahydroquinoline analogies. In the first step α,α′-bis(substituted-benzylidene)cycloalkanones are reacted with malononitrile to afford 2-amino-3-cyano-4H-pyrans.
Enayatollah Sheikhhosseini +2 more
doaj +1 more source
Facile One-Pot Synthesis of Photochromic Pyrans [PDF]
, 2016 Photochromic pyrans, including [3H]naphtho[2,1-b]pyrans, [2H]naphtho[1,2-b]pyrans, indeno-fused naphtho[1,2-b]pyrans, and heteroannulated pyrans, were synthesized in excellent yields through a facile one-pot procedure by reaction of propargyl alcohol and
Weili Zhao (1694086) +1 more
core +1 more source
Nitriles in heterocyclic synthesis: Novel syntheses of benzo[b]pyrans, naphtho[1,2-b]pyrans, naphtho[2,1-b]pyrans, pyrano[3,2-h]quinolines and pyrano[3,2-c]quinolines [PDF]
, 1988 Benzo[b]pyrans, naphtho[1,2-b]pyrans, naphtho[2,1-b]pyrans, pyrano[3,2-h]quinolines, and pyrano[3,2-c]quinolines were synthesized by the reaction of cinnamonitriles with phenols, naphthols, 8-hydroxyquinoline, and 1-methyl-4-hydroxy-2-quinoline.
Mohamed H. Elnagdi +3 more
core +1 more source
[DBN][HSO4]-Promoted facile and green synthesis of 2-Amino-4H-pyrans derivatives under microwave irradiation [PDF]
, 2021 The [DBN][HSO4] -promoted Knoevenagel condensation followed by cyclization protocol has been developed for the first time by a successive reaction of aldehydes, dimedone and malononitrile to afford 2-Amino-4H-pyrans derivatives in high to excellent ...
Mane, Dhanjay, Mane, Vishal
core +2 more sources
Populene D Analogues: Design, Concise Synthesis and Antiproliferative Activity
Molecules, 2012 An efficient and concise synthesis of nine populene D analogues was performed using an iodine-catalyzed Prins cyclization as the key transformation.
Kachi R. Kishore Kumar Reddy +4 more
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Gold(I)-catalysed one-pot synthesis of chromans using allylic alcohols and phenols [PDF]
, 2013 A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel–Crafts allylation/intramolecular hydroalkoxylation sequence.
Barker, Graeme +7 more
core +1 more source
Synthesis of New 2-Substituted 4-(2-Furyl)-4H-pyrans [PDF]
, 1994 Substituted 2-amino-3-cyano-4H-pyrans represent important precursors in syntheses of condensed heterocycles containing a 4H-pyran nucleus. In the context of studies of reactivity of 2-amino-5-acetyl-4-(5-X-2-furyl)-3-cyano-6-methyl-4H-pyrans we were ...
Dušan Ilavský +3 more
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Green Processing and Synthesis, 2018 A series of pentasubstituted 4H-pyrans and tetrahydrobenzo[b]pyrans are synthesized with excellent yields via a one-pot condensation of aromatic aldehydes, malononitrile, and a dicarbonyl compound, ethyl acetoacetate, acetyl-acetone or dimedone, in the ...
Magyar Ágnes, Hell Zoltán
doaj +1 more source
Applied Sciences, 2012 The reaction of 2,4-diethoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran (1) with aromatic compounds in refluxing acetonitrile in the presence of p-toluenesulfonic acid gave the mixture of 4-aryl-2-trifluoromethyl-4H-pyrans (3) and 6-aryl-1,1,1-trifluorohexa ...
Norio Ota +4 more
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Highly Stereoselective Brønsted Acid Catalyzed Synthesis of Spirooxindole Pyrans [PDF]
, 2016 A Brønsted acid-catalyzed Prins-type cyclization sequence to construct spirooxindole pyrans in high yields and excellent diastereoselectivity has been developed.
Jingqi Wang (748537) +2 more
core +3 more sources