Regioselectivity Differentiation in Metalations of 3,5-Dichloro-Tertiary versus Secondary Benzamides
Hunt, David A.
Bradley, Lynn M.
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Metalation regioslectivity of 3,5-dichlorobenzamides is a function of the type of amide (secondary versus tertiary) used in the sequence. Metalation at the 2-position (adjacent to the carboxamide functional group) occurs when the secondary benzamide is metalated with sec-butyllithium/ TMEDA mediated through complex-induced proximity effects (CIPE) process, whereas metalation with sec-butyllithium/TMEDA occurs exclusively at the 4-position when the tertiary benzamide is used under identical reaction conditions.
Khani, F. , Fleming, T. , Collins, C. , Tabakin, E. , Bradley, L. and Hunt, D. (2016) Regioselectivity Differentiation in Metalations of 3,5-Dichloro-Tertiary versus Secondary Benzamides. International Journal of Organic Chemistry, 6, 142-146.