Synthesis of imines

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Recent Literature

A mild three-component reaction of aromatic aldehydes, alkyl bromides, and aqueous ammonia as the nitrogen source gives imines in very good yields. The reaction conditions are compatible with a range of functional groups. The reaction of aldehydes and aqueous ammonia with epoxides leads to imines bearing a vicinal hydroxyl group regioselectively.
J.-M. Huang, J.-F. Zhang, Y. Dong, W. Gong, J. Org. Chem., 2011, 76, 3511-3514.

Neat non-volatile amines react efficiently with various aromatic aldehydes in the absence of any catalyst or solvent, to give imines after a reaction time of eight minutes under microwave irradiation. 1,3-dimethylurea dispersed on montmorillonite K10 is used as an methylamine precursor.
L. Paquin, J. Hamelin, F. Texier-Boullet, Synthesis, 2006, 1635-1638.

Manganese dioxide is employed as an in situ oxidant for the one-pot conversion of alcohols into imines. In combination with polymer-supported cyanoborohydride (PSCBH), a one-pot oxidation-imine formation-reduction sequence enables alcohols to be converted directly into both secondary and tertiary amines.
L. Blackburn, R. J. K. Taylor, Org. Lett., 2001, 3, 1637-1639.

Imines and secondary amines were synthesized selectively by a Pd-catalyzed one-pot reaction of benzyl alcohols with primary amines. The reactions did not require any additives and were effective for a wide range of alcohols and amines.
M. S. Kwon, S. Kim, S. Park, W. Bosco, R. K. Chidrala, J. Park, J. Org. Chem., 2009, 74, 2877-2879.

An intermolecular reductive Schiff base formation from nitroarenes and benzaldehydes to yield diarylimines is carried out in the presence of iron powder and dilute acid. This process tolerates various functional groups and often proceeds quantitatively with no need for purification.
A. L. Korich, T. S. Hughes, Synlett, 2007, 2602-2604.

By employing Pd(OAc)₂ and (t-Bu)₂PNP(i-BuNCH₂CH₂)₃N as ligand, a broad range of aryl bromides and chlorides possessing base-sensitive substituents provide coupling products with bulky aryl amines in good to excellent yields. An efficient coupling of vinyl bromides with a variety of amines produces imines and enamines at room temperature.
Ch. V. Reddy, J. V. Kingston, J. G. Verkade, J. Org. Chem., 2008, 73, 3047-3062.

A high-yielding, asymmetric synthesis of novel 4-formyl-1-(2- and 3-haloalkyl)azetidin-2-ones was developed as valuable starting materials for the synthesis of different enantiomerically enriched bicyclic azetidin-2-ones, such as piperazine, morpholine, and 1,4-diazepane annulated β-lactam derivatives.
W. Van Brabandt, M. Vanwalleghem, M. D'hooghe, N. De Kimpe, J. Org. Chem., 2006, 71, 7083-7086.

Readily available and stable titanocene-alkyne complexes can be used for the hydroamination of internal and terminal alkynes. The reactions of terminal alkynes with aliphatic amines proceed highly selectively to give the corresponding primary anti-Markovnikov functionalized imines in good to excellent yields.
A. Tillack, I. G. Castro, C. G. Hartung, M. Beller, Angew. Chem. Int. Ed., 2002, 41, 2541-2543.

A number of new reactions of IBX with heteroatom-containing substrates were discovered and their utility was demonstrated. IBX was used for the generation of imines from secondary amines in notably high yields, for the oxidative aromatization of nitrogen heterocycles and for the cleavage of dithianes.
K. C. Nicolaou, C. J. N. Mathison, T. Montagnon, Angew. Chem., 2003, 115, 4211-4216.

[RuCl₂(CO)₃]₂/dppp is a highly effective catalyst system for the intramolecular oxidative amination of various aminoalkenes in presence of K₂CO₃ and allyl acetate in N-methylpiperidine to give the corresponding cyclic imines and indoles in excellent yields.
T. Kondo, T. Okada, T.-A. Mitsudo, J. Am. Chem. Soc., 2002, 124, 186-187.

A transition-metal-free oxidative C-C bond cleavage process for a broad range of ester and dicarbonyl compounds involves carbanion addition to nitrosobenzene and proceeds via fragmentation of a previously unobserved oxazetidin-4-one heterocycle.
J. N. Payette, H. Yamamoto, J. Am. Chem. Soc., 2008, 130, 12276-12278.

A highly regioselective hydroamination of unsymmetrical electron-poor and electron-rich alkynes with anilines is catalyzed by Au(I) under mild conditions. In addition, applications toward indole syntheses are presented including an example of a one-pot synthesis from a nonfunctionalized aniline.
S. Kramer, K. Dooleweerdt, A. T. Lindhardt, M. Rottländer, T. Skrydstrup, Org. Lett., 2009, 11, 4208-4211.

The reaction of aldehydes, amines, and TMSCN in the presence of 2-iodoxybenzoic acid (IBX) and tetrabutylammonium bromide (TBAB) afforded α-iminonitriles in good to excellent yields under mild conditions. The presence of TBAB is essential for this transformation.
P. Fontaine, A. Chiaroni, G. Masson, J. Zhu, Org. Lett., 2008, 10, 1509-1512.