A novel and convenient approach toward the synthesis of Rizatriptan

Given article describes the synthesis of 5-HT1 agonist rizatriptan via the construction of an indole ring on 3-Methyl-4-nitrobenzoic acid methyl ester by Leimgruber-Batcho reaction. The indole intermediate obtained is then further converted to rizatriptan, a triptan-class compound. Using simple, facile and an efficient methodology, rizatriptan was prepared. Graphical abstract: The construction of the indole ring was carried out on 3-methyl-4-nitrobenzoic acid methyl ester. The indole intermediate obtained was then treated with Oxalyl chloride to get an oxoacetyl indole carboxylate intermediate. The Intermediate obtained was then further converted to rizatriptan.[Figure not available: see fulltext.].