Facile Synthesis of 2,3,6,11-Tetrahydro-1H,5H-indolizino[8,7-b]indole-11b-Carboxylic Acid Methyl Ester via a 9-BBN-Mediated Tertiary Lactam Reduction
A facile synthesis of 2,3,6,11-tetrahydro-1H,5H-indolizino[8,7-b]indole-11b-carboxylic acid methyl ester, a versatile intermediate utilized in the synthesis of indole alkaloids, was achieved in two steps. Condensation of tryptamine with dimethyl α-ketoglutarate led to the formation of the corresponding indolizino[8,7-b]indolone ester, which subsequently underwent an efficient lactam reduction with 9-BBN to generate the tertiary amine ester in good yield.
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