Abstract
A new bimolecular pathway for a model aza-MBH reaction is presented and then explored in more details by DFT/M06-2X calculations. For this bimolecular pathway, explicit formic acid was considered in the rate-determining step showing the beneficial action from this additive, which plays a role as a co-catalyst. According to the current computations, this mechanistic cycle is a feasible pathway for the formation of the aza adduct and it explains the experimental detection of a key intermediate. A comparative analysis of the current results and previous ones reveals the substrate and medium dependence of the aza-MBH reaction. These factors lead to distinct pathways for the reaction, uncovering the complexity for conducting this reaction.
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Acknowledgments
A.P.d.L.B. is thankful to Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grant #2013/22235-0 and the support of the Computation Center of the University of São Paulo (LCCA-USP). FC thanks FAPESP for research Grants #2013/10449-5 and 2013/07600-3 and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for research fellowship. A.A.C.B. thanks FAPESP for research Grant #2015/01491-3.
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de Lima Batista, A.P., Coelho, F. & Braga, A.A.C. DFT exploration of mechanistic pathways of an aza-Morita–Baylis–Hillman reaction. Theor Chem Acc 135, 186 (2016). https://doi.org/10.1007/s00214-016-1946-1
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DOI: https://doi.org/10.1007/s00214-016-1946-1