Abstract
Aluminum (Al) is an ideal reducing agent (electron pool) since it is cheap, easy to handle, able to release enough electron (3 e- / atom), and environment friendly. However, the use of Al in organic synthesis is rather limited owing to lack of efficient electron transfer process between Al and organic substances. In last decay, we and some other groups developed multi-redox promoted reactions using Al as a terminal reductant in which Al act as an electron pool and a catalytic amount of metal salt(s) works as a mediator for electron transfer from Al to substrates. Indeed, various combinations of Al and metal salt(s), e.g., Al / PbBr2, Al / PbBr2 / AlBr3, Al / NiCl2 / CrCl2, Al / PbBr2 / TFA, Al / PbBr2 / NiCl2(bpy), etc., have been developed to promote carbon-carbon bond formation as well as highly selective functionalization. Further more, these multi-redox promoted reactions have been successfully utilized for the synthesis of useful compounds, such as β-lactam antibiotics and β-lactamase inhibitors. This review article will summarize the recent progress in the multi-metal redox promoted reactions using Al as an electron pool and their applications to organic synthesis.
Keywords: electron pool, Aluminum
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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