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Indole is used in the preparation of gramine, which is obtained by Mannich reaction dimethylamine and formaldehyde. It is used as a starting material for the preparation of oxindole and indole-3-carboxaldehyde. In Diels-Alder reaction, it acts as dienophile and reacts with 2-aminofuran to get strychnine. It is the active component of jasmine oil, neroli oil and orange-blossom oil used in the perfume industry. Further, it is involved in the preparation of synthetic jasmine oil.
Lithiation of N-protected indoles usually occurs at the 2-position, e.g. benzenesulfonation of the 1-lithio derivative, 2-lithiation with LDA and treatment with pyridine-3,4-dicarboxylic anhydride. This sequence has been reported in a synthetic route to ellipticene and olivacine: J. Org. Chem., 57, 5891 (1992).
Regioselective synthesis of 3-substituted indoles has been described using a sequence of N-silylation, 3-bromination of the 1-TBDMS detivative with NBS, 3-lithiation, treatment with an electrophile to introduce the 3-substituent, and desilylation with TBAF. Good overall yields are obtained for a range of electrophiles: J. Org. Chem., 59, 10 (1994); Org. Synth. Coll., 9, 417 (1998).
Treatment with EtMgI followed by ZnCl2 leads to an N-zinc derivative. This undergoes acylation at the 3-position: Tetrahedron, 46, 6061 (1990).
Halogenation in the 2-position has been effected via the Li 1-carbamate and subsequent 2-lithiation: J. Org. Chem., 57, 2495 (1992):
Treatment of the carbamate with Tri-n-butyltin chloride, A10746, followed by Stille coupling enables synthesis of 2-aryl- and 2-vinylindoles: J. Org. Chem., 60, 6218 (1995).
Johnston, A. J.; Zhang, Y. R.; Busch, S.; Pardo, L. C.; Imberti, S.; McLain, S. E. Amphipathic Solvation of Indole: Implications for the Role of Tryptophan in Membrane Proteins. J. Phys. Chem. B 2015, 119 (19), 5979-5987.
Yang, P.; Pang, M.; Shen, W.; Li, M.; He, R. Vibronic analysis of the 1Lb ? S0 transitions of indole and 3-methylindole: The influence of anharmonic, Duschinsky, and Herzberg-Teller contributions. J. Mol. Spectrosc. 2015, 313, 40-48.
Gefahrenhinweise (EU): H302-H311-H318
Harmful if swallowed. Toxic in contact with skin. Causes serious eye damage.
Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER/doctor IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.