So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Lindsay-Scott, Peter J.; Rivlin-Derrick, Eloise researched the compound: 2-(2-Bromoethoxy)tetrahydro-2H-pyran( cas:17739-45-6 ).Computed Properties of C7H13BrO2.They published the article 《Regiocontrolled Synthesis of 6,7-Dihydro-4H-pyrazolo[5,1-c][1,4]oxazines》 about this compound( cas:17739-45-6 ) in Synthesis. Keywords: dihydropyrazolooxazine regioselective preparation. We’ll tell you more about this compound (cas:17739-45-6).
Synthesis of 6,7-dihydro-4H-pyrazolo[5,1- c][1,4]oxazines wad achieved in 3-4 steps from com. available pyrazoles. Optimization of a protected hydroxyethyl group on N1 enabled the regiocontrolled construction of pyrazole-5-aldehydes in high yields; subsequent deprotection and reduction generated fused heterocyclic scaffolds bearing multiple substitution patterns. Moreover, the intermediate pyrazole lactols were showed to be versatile synthetic building blocks.
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Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem