DBU mediated one-pot synthesis of triazolo triazines <i>via</i> Dimroth type rearrangement
作者:Ab Majeed Ganai、Tabasum Khan Pathan、Nisar Sayyad、Babita Kushwaha、Narva Deshwar Kushwaha、Andreas G. Tzakos、Rajshekhar Karpoormath
DOI:10.1039/d1ra07749j
日期:——
Herein we report an efficient one-pot synthesis of [1,2,4]triazolo[1,5 a][1,3,5]triazines from commercially available substituted aryl/heteroaryl aldehydes and substituted 2-hydrazinyl-1,3,5-triazines via N-bromosuccinimide (NBS) mediated oxidative C–N bond formation. Isomerisation of [1,2,4]triazolo[4,3-a][1,3,5]triazines to [1,2,4]triazolo[1,5-a][1,3,5]triazines is driven by 1,8-diazabicyclo[5.4.0]undec-7-ene
在此,我们报道了一种有效的一锅法合成 [1,2,4]triazolo[1,5a ][1,3,5]triazines,由市售的取代芳基/杂芳基醛和取代的 2-肼基-1,3 , 5-三嗪通过 N-溴代琥珀酰亚胺 (NBS) 介导的氧化 C-N 键形成。[1,2,4]三唑并[4,3- a ][1,3,5]三嗪异构化为[1,2,4]三唑并[1,5- a ][1,3,5]三嗪是由 1,8-二氮杂双环[5.4.0]undec-7-ene (DBU) 驱动,这两种异构体均具有良好的产率 (70–96%)。