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Synthesis of amidines

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The condensation of primary amine with N,N-dimethylacetamide dimethyl acetal yields a mixture of acetamidine and imidate ester depending on the temperature, solvent, and structure of the primary amine. It is possible to suppress the formation of imidate ester by performing the reaction in the presence of excess dimethyl amine, yielding acetamidine as the exclusive product.
J. R. Harjani, C. Liang, P. G. Jessop, J. Org. Chem., 2011, 76, 1683-1691.


The reaction of enamines with azides proceeds under catalyst-free conditions and results in the formation of either sulfonyl amidine or β-amino sulfonyl enamine derivative in good yields.
T. Gao, M. Zhao, X. Meng, C. Li, B. Chen, Synlett, 2011, 1281-1284.


The addition of amines to nitriles catalyzed by ytterbium amides gives monosubstituted N-arylamidinates in good to excellent yields at 100C under solvent-free conditions.
J. Wang, F. Xu, Q. Shen, Org. Lett., 2008, 10, 445-448.


NaI-catalyzed direct condensation of sulfonamides and formamides enables N-sulfonyl formamidine synthesis without hazardous reagents or transition-metal catalysts. The green methodology features high atom economy, operational simplicity, and good tolerance with diverse functional groups.
S. Chen, Y. Xu, X. Wan, Org. Lett., 2011, 13, 6152-6155.


Cu-catalyzed aerobic oxidative three-component coupling of a terminal alkyne, secondary amine, and sulfonamide enables an efficient synthesis of amidines. The use of Cu(OTf)2 as catalyst produces amidines selectively via an initial oxidative coupling of the terminal alkyne with the secondary amine, followed by hydroamidation of the ynamine intermediate with the sulfonamide. Glaser-Hay alkyne homocoupling products are not observed.
J. Kim, S. S. Stahl, J. Org. Chem., 2015, 80, 2448-2454.


A highly efficient, mild, copper-catalyzed multicomponent reaction for the synthesis of N-sulfonylamidines has been developed. This reaction has an extremely wide scope with regard to all three coupling components of alkyne, sulfonyl azide, and amine. Two plausible mechanistic pathways are discussed.
I. Bae, H. Han, S. Chang, J. Am. Chem. Soc., 2005, 127, 2038-2039.

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Amidines can be prepared by reducing acylated amidoximes with potassium formate. This method has proved to be very simple and effective.
K. Nadrah, M. Sollner Dolenc, Synlett, 2007, 1257-1258.