Steric hindrance classified: treatment of isothiocyanatoallene with secondary amines bearing bulky substituents to generate 2-aminothiazoles‡

Literature Information

Publication Date 2019-05-17
DOI 10.1039/C9QO00312F
Impact Factor 5.281
Authors

Klaus Banert, Jennifer Seifert


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Abstract

Twenty secondary amines, bearing two secondary, two tertiary, or a secondary and a tertiary alkyl group or a neopentyl group, were treated with allenyl isothiocyanate to prepare the corresponding 2-dialkylamino-5-methylthiazoles. The relative rates of these reactions, which were strongly dependent on the steric demand of the N-alkyl groups, were measured by using competition experiments and analysis by 1H NMR spectroscopy. Not only steric, but also some electronic effects on the nucleophilicity of the dialkylamines were discussed.

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