Synthesis 2017; 49(10): 2286-2296
DOI: 10.1055/s-0036-1588411
paper
© Georg Thieme Verlag Stuttgart · New York

Reactions of o-Quinone Methides with Halogenated 1H-Azoles: Access to Benzo[e]azolo[1,3]oxazines

Dmitry V. Osipov
a   Department of Organic Chemistry, Chemical Technological Faculty, Samara State Technical University, 244 Molodogvardeyskaya St., Samara 443100, Russian Federation
,
Vitaly A. Osyanin*
a   Department of Organic Chemistry, Chemical Technological Faculty, Samara State Technical University, 244 Molodogvardeyskaya St., Samara 443100, Russian Federation
b   Organic Chemistry Department, Faculty of Science, RUDN University, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation   eMail: VOsyanin@mail.ru
,
Leonid G. Voskressensky
b   Organic Chemistry Department, Faculty of Science, RUDN University, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation   eMail: VOsyanin@mail.ru
,
Yuri N. Klimochkin
a   Department of Organic Chemistry, Chemical Technological Faculty, Samara State Technical University, 244 Molodogvardeyskaya St., Samara 443100, Russian Federation
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Publikationsverlauf

Received: 18. November 2016

Accepted after revision: 13. Januar 2017

Publikationsdatum:
02. Februar 2017 (online)


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Abstract

A simple route to the series of azolo-condensed benzo[e][1,3]oxazines such as 9H-benzo[e][1,2,4]triazolo[5,1-b][1,3]oxazines, 9H-benzo[e]pyrazolo[5,1-b][1,3]oxazines, and 5H-benzo[e]imidazo[2,1-b][1,3]oxazines has been developed. The reaction proceeds through formation of an ortho-quinone methide intermediate followed by aza-Michael addition of the halogenoazoles to the o-quinone methide and intramolecular nucleophilic substitution.

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