This protocol describes an electrochemical synthesis of 1,2-diazides from alkenes. Organic azides are highly versatile intermediates for synthetic chemistry, materials, and biological applications. 1,2-Diazides are commonly reduced to form 1,2-diamines, which are prevalent structural motifs in bioactive natural products, therapeutic agents, and molecular catalysts. The electrochemical formation of 1,2-diazides involves the anodic generation of an azidyl radical from sodium azide, followed by two successive additions of this N-centered radical to the alkene, and is assisted by a Mn catalyst. The electrosynthesis of 1,2-diazides can be carried out using various experimental setups comprising custom-made or commercially available reaction vessels and a direct-current power supply. Readily accessible electrode materials can be used, including carbon (made from reticulated vitreous carbon and pencil lead), nickel foam, and platinum foil. This protocol is also demonstrated using ElectraSyn, a standardized electrochemistry kit. Compared with conventional synthetic approaches, electrochemistry allows for the precise control of the anodic potential input, eliminates the need for stoichiometric and often indiscriminate oxidants, and minimizes the generation of wasteful byproducts. As such, our electrocatalytic synthesis exhibits various advantages over existing methods for alkene diamination, including sustainability, operational simplicity, substrate generality, and exceptional functional-group compatibility. The resultant 1,2-diazides can be smoothly reduced to 1,2-diamines in a single step with high chemoselectivity. To exemplify this, we include a procedure for catalytic hydrogenation using palladium on carbon. This protocol, therefore, constitutes a general approach to accessing 1,2-diazides and 1,2-diamines from alkenes.
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Financial support was provided by Cornell University and the Atkinson Center for a Sustainable Future. S.L. is thankful to the National Science Foundation (NSF) for a CAREER Award (CHE-1751839). This study made use of the Cornell Center for Materials Research Shared Facilities supported by NSF MRSEC (DMR-1719875) and an NMR facility supported by the NSF (CHE-1531632). G.S.S. is grateful for an NSF Graduate Fellowship (DGE-1650441). We thank P. Baran and IKA for their generous gift of ElectraSyn.
The authors declare no competing interests.
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Key references using this protocol
1. Fu, N., Sauer, G.S., Saha, A., Loo, A. & Lin, S. Science, 357, 575–579 (2017). https://doi.org/10.1126/science.aan6206
2. Fu, N., Sauer, G.S. & Lin, S. J. Am. Chem. Soc. 139, 15548–15553 (2017). https://doi.org/10.1021/jacs.7b09388
3. Ye, K.-Y., Pombar, G., Fu, N., Sauer, G.S., Keresztes, I. & Lin, S. J. Am. Chem. Soc. 140, 2438–2441 (2018). https://doi.org/10.1021/jacs.7b13387
Integrated supplementary information
Preparation of the nickel cathode and carbon anode for electrocatalytic diazidation of alkenes
Left: Ni foam and RVC electrodes and the electrode holders; Right: Ni foam and RVC electrode assemblies as described in Box 1
Top: ElectraSyn vial cap; Bottom left: ElectraSyn vial (10 mL) with Teflon tape wrapped around the thread. Bottom middle: RVC electrode assembly. Bottom right: Ni foam electrode assembly
IKA EletraSyn setup: vial assembly
IKA EletraSyn setup: reactor assembly
Custom two-neck glass tube for small-scale electrolysis with standard no. 15 internal thread and 14/20 joint
Left: Electrical feedthrough with 2 mm sockets created as described in Box 2. Right: Teflon cap as created in Box 2, including a #15 Teflon bushing, two electrical feedthroughs, and an O-ring; viewed from the side
Left: Electrical feedthrough created as described in Box 2. Right: Teflon cap as created in Box 2; viewed from the bottom
Left: Disassembled Teflon cap showing the hole drilled in the Teflon. Right: Electrical feedthrough created as described in Box 2
TGA data for (3,4-diazidobutyl)benzene (3)
TGA data for trans-2,3-diazido-1-tosylindoline (4)
TGA data for methyl 2,3-diazido-3-methyl-2-phenylbutanoate (7)
TGA data for 4-(1,2-diazidoethyl)benzaldehyde (9)
TGA data for 1,2-diazidoethyl ferrocene (13)
TGA data for sodium azide
1H NMR spectrum for a mixture of (2,3-diazidopropyl)benzene (16) and (1,2,3-triazidopropyl)benzene (17)
13C NMR spectrum for a mixture of (2,3-diazidopropyl)benzene (16) and (1,2,3-triazidopropyl)benzene (17)
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Fu, N., Sauer, G.S. & Lin, S. A general, electrocatalytic approach to the synthesis of vicinal diamines. Nat Protoc 13, 1725–1743 (2018). https://doi.org/10.1038/s41596-018-0010-0
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