Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Chloro(1,5-cyclooctadiene)copper(I) dimer, is researched, Molecular C16H16Cl2Cu2, CAS is 32717-95-6, about Oxazepine Synthesis by Copper-Catalyzed Intermolecular Cascade Reactions between O-Propargylic Oximes and Dipolarophiles.Name: Chloro(1,5-cyclooctadiene)copper(I) dimer.
Oxazepines I [R1 = n-Pr, cyclohexyl, Ph, 4-F3CC6H4, 4-MeOC6H4; R2 = n-Pr, Me3SiCH2, Ph, 4-MeOC6H4, 4-F3CC6H4; R3 = H, 4-F3CC6H4; R5 = H, R4R6 = C(O)NR7C(O), R7 = H, Me, t-Bu, Ph, etc.; R4 = H, R5 = R6 = MeO2C, i-PrO2C; etc.] were efficiently prepared from O-propargylic oximes II and dipolarophiles R4R5C:CHR6 via copper-catalyzed cascade reactions which proceed through a 2,3-rearrangement, [3 + 2] cycloaddition, and subsequent 1,3-oxygen migration. The process involves the cleavage of C-O and N-O bonds.
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider