σ‑Bond Migration Assisted Decarboxylative
Activation of Vinylene Carbonate in Rh-Catalyzed 4 + 2 Annulation:
A Theoretical Study
Posted on 2020-07-21 - 20:43
As
a C2 synthon, vinylene carbonate has been used instead of acetylene
in transition-metal catalyzed-coupling reactions. In this study, the
mechanism of the vinylene carbonate activation mode for the Rh(III)-catalyzed
4 + 2 annulation of benzamide and vinylene carbonate reaction is proposed,
and it was investigated by DFT with the M06 density functional. The
computational results show that the proposed reaction pathway, which
includes the insertion of vinylene carbonate into an Rh–C bond,
decarboxylation of the seven-membered rhodacycle intermediate, protonation
of the ketonate rhodium intermediate, deprotonation of the benzamide,
and catalyst regeneration, is the most favorable pathway. The 1,2-rhodium
migration process can assist decarboxylative activation of vinylene
carbonate, which is the rate-determining step in the catalytic cycle.
The IRC calculation clearly revealed a quasi-synchronized process
to directly afford a cyclic ketonate rhodium intermediate by the release
of carbon dioxide.
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Shen, Boming; Liu, Song; Zhu, Lei; Zhong, Kangbao; Liu, Fenru; Chen, Haohua; et al. (1753). σ‑Bond Migration Assisted Decarboxylative
Activation of Vinylene Carbonate in Rh-Catalyzed 4 + 2 Annulation:
A Theoretical Study. ACS Publications. Collection. https://doi.org/10.1021/acs.organomet.0c00248