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• W2891787835 abstract "2H-Azirines are versatile coupling partners for the synthesis of N-heterocycles. Herein, we present our studies on the reactivity of Cp2Ti(BTMSA) (1; BTMSA = bis(trimethylsilyl)acetylene) with a variety of azirines. In all the cases examined, the initial organometallic products formed are diazatitanacyclohexenes, presumably formed via oxidative addition of Ti(II) into the C–N bond of the azirine to form an azatitanacyclobutene intermediate, followed by C═N insertion of a second equivalent of azirine into the Ti–C bond to form the observed products. Diazatitanacyclohexene 3, bearing phenyl substituents and derived from 2,3-diphenyl-2H-azirine, fragments to form an azabutadiene and nitrile, which is shown to be catalytic in the presence of excess 2,3-diphenyl-2H-azirine. H-substituted complex 8, derived from 3-phenyl-2H-azirine, decomposes via protonolysis of the Cp ligands. In contrast, the methyl-substituted diazatitanacyclohexene 10, derived from 2-methyl-3-phenyl-2H-azirine, is thermally robust. Attempts to trap the putative azatitanacyclobutene intermediate with an alkyne were unsuccessful, resulting instead in the formation of titanacyclopentadiene (12) from coupling of alkyne with BTMSA. Initial reactivity studies found that 10 could be protonolyzed with AcOH to form mixtures of pyrrole and aziridine products, whereas reacting 10 with MeOH results solely in the formation of 2,4-dimethyl-3,5-diphenyl-1H-pyrrole." @default.
• W2891787835 created "2018-09-27" @default.
• W2891787835 creator A5042165373 @default.
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• W2891787835 date "2018-09-10" @default.
• W2891787835 modified "2023-09-23" @default.
• W2891787835 title "Diverse Reactivity of Diazatitanacyclohexenes: Coupling Reactions of 2<i>H</i>-Azirines Mediated by Titanium(II)" @default.
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• W2891787835 doi "https://doi.org/10.1021/acs.organomet.8b00522" @default.
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