title: Hypervalent iodine(iii)-promoted N-incorporation into N-aryl vinylogous carbamates to quinoxaline diesters: access to 1,4,5,8-tetraazaphenanthrene.
abstract: A novel oxidative N-incorporation strategy for synthesis of quinoxaline diesters under metal-free conditions is described for the first time. The mild reaction conditions allow for this transformation via the formation of two C(sp(2))-N bonds utilizing cheaply available NaN3 as the N-atom source. N-Aryl vinylogous carbamates in this study undergo azidation at enamino C(sp(2))-H selectively. The robustness of this strategy is further demonstrated by the synthesis of a valuable 1,4,5,8-tetraazaphenanthrene derivative using a mild and convenient approach.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502285, Sangareddy, Telangana, India. sharada@iith.ac.in.
authors.forename: A
authors.initials: A
authors.lastname: Sagar
authors.affiliation: Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502285, Sangareddy, Telangana, India. sharada@iith.ac.in.
authors.forename: Shinde
authors.initials: S
authors.lastname: Vidaycharan
authors.affiliation: Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502285, Sangareddy, Telangana, India. sharada@iith.ac.in.
authors.forename: Anand H
authors.initials: AH
authors.lastname: Shinde
authors.affiliation: Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502285, Sangareddy, Telangana, India. sharada@iith.ac.in.
authors.forename: Duddu S
authors.initials: DS
authors.lastname: Sharada