cas 56394-22-0, 6-BROMO-3-CYANO-4-METHYLCOUMARIN

Articles about 56394-22-0Total 5 be found

One-Pot Green Synthesis of 2-Oxo-2H-chromene-3-carbonitriles Using Dual-Frequency Ultrasonication
Abstract: A green synthesis of 2-oxo-2H-chromene-3-carbonitriles has been carried out in one step by reacting 2-hydroxybenzaldehydes or 2-hydroxyacetophenones with ethyl cyanoacetate under dual-frequency ultrasonica-tion (ultrasonic bath of 40 KHz and probe of 20 KHz). The compounds were obtained in very high yield, and their structures were confirmed by IR and NMR data.
Aruna,Kumar, S.,Sharma, S. P.,Vashisht, N.
p. 1508 - 1512
(2021/10/26)

Iridium-catalyzed direct asymmetric vinylogous allylic alkylation
The catalytic asymmetric vinylogous allylic alkylation of α,β-unsaturated lactones (including coumarins) was achieved with excellent regio- and enantioselectivity. Transformations of the product were carried out by means of the versatile terminal olefin and lactone moieties. The synthetic application of the present methodology was showcased by the asymmetric synthesis of an advanced synthetic Merck intermediate toward a new drug candidate.
Shi, Chang-Yun,Xiao, Jun-Zhao,Yin, Liang
supporting information
p. 11957 - 11960
(2018/11/02)

Iodine-mediated one-pot synthesis of 3-cyanocoumarins and 3-cyano-4-methylcoumarins
2-Hydroxybenzaldehydes 1a-e on reaction with malononitrile (2) in the presence of iodine as catalyst give 3-cyanocoumarins 3a-e in one step under thermal heating as well as under microwave irradiation. The latter conditions are much more efficient in terms of time (2-5 min) and yield as compared to the thermal conditions (2-2.5 h). Following a similar procedure, 3-cyano-4-methylcoumarins 3f-i were also prepared by the reaction of 2-hydroxyacetophenones 1f-i with 2.
Sharma, Dinesh,Makrandi, Jagdish K.
p. 527 - 531
(2014/06/10)

Migratory decarboxylative coupling of coumarins: Synthetic and mechanistic aspects
On the move: Decarboxylative coupling of allyl 4-methyl-3-carboxycoumarins provides the products of γ-allylation of the methyl group rather than the typical regiospecific α-allylation. Mechanistic studies show that intramolecular proton transfer from the 4-methyl group to the 3-carboxylate allows allylation of the remote methyl group. The resulting 4-butenyl-3-carboxyl coumarin undergoes Pd0-catalyzed decarboxylation to provide the observed products (see scheme). Copyright
Jana, Ranjan,Partridge, James J.,Tunge, Jon A.
supporting information; experimental part
p. 5157 - 5161
(2011/07/30)

Tetrazole coumarin derivatives
A novel class of 3-tetrazole coumarins have anti-allergic activity. They are prepared by the action of ammonium azide on 3-cyano compounds.
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(2008/06/13)