Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Efficient Use of 1,2-Dihaloazine Synthons in Transition-Metal-Free Preparation of Doverse Heterocycle-Fused 1,4-Oxazepines. / Sapegin, A.V.; Kalinin, S.A.; Smirnov, A.V.; Dorogov, M.V.; Krasavin, M.
в: European Journal of Organic Chemistry, Том 2015, № 6, 2015, стр. 1333-1340.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Efficient Use of 1,2-Dihaloazine Synthons in Transition-Metal-Free Preparation of Doverse Heterocycle-Fused 1,4-Oxazepines
AU - Sapegin, A.V.
AU - Kalinin, S.A.
AU - Smirnov, A.V.
AU - Dorogov, M.V.
AU - Krasavin, M.
PY - 2015
Y1 - 2015
N2 - © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. A previously reported condensation reaction of ambiphilic 2-(1H-pyrazol-5-yl)phenols with various o-chloro-substituted nitroaromatic synthons to provide medicinally important tetracyclic pyrazolo[1,5-d][1,4]oxazepines was extended to more readily available and convenient-to-use 1,2-dihaloazines. Although 4,5-dichloropyridazin-3(2H)-ones and 2,3-dichloropyrazine are popular bis(electrophilic) partners in various SNAr-type condensations and also were efficiently used in the reaction reported herein, the facility with which various 3-bromo-2-chloropyridines underwent the same cyclization was unexpected. These reactions are presumed to occur as sequential intermolecular SNAr/Smiles rearrangement/intramolecular SNAr tandem reactions and provide a rare example of the transition-metal-free substitution of a bromine atom at the 3-position of a pyridine ring.
AB - © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. A previously reported condensation reaction of ambiphilic 2-(1H-pyrazol-5-yl)phenols with various o-chloro-substituted nitroaromatic synthons to provide medicinally important tetracyclic pyrazolo[1,5-d][1,4]oxazepines was extended to more readily available and convenient-to-use 1,2-dihaloazines. Although 4,5-dichloropyridazin-3(2H)-ones and 2,3-dichloropyrazine are popular bis(electrophilic) partners in various SNAr-type condensations and also were efficiently used in the reaction reported herein, the facility with which various 3-bromo-2-chloropyridines underwent the same cyclization was unexpected. These reactions are presumed to occur as sequential intermolecular SNAr/Smiles rearrangement/intramolecular SNAr tandem reactions and provide a rare example of the transition-metal-free substitution of a bromine atom at the 3-position of a pyridine ring.
U2 - 10.1002/ejoc.201403397
DO - 10.1002/ejoc.201403397
M3 - Article
VL - 2015
SP - 1333
EP - 1340
JO - European Journal of Organic Chemistry
JF - European Journal of Organic Chemistry
SN - 1434-193X
IS - 6
ER -
ID: 3924605