Article Sidebar
Published:
Sep 29, 2015Keywords:
Article Details
Copyright for articles published in this journal is retained by the journal.
SAJChem applies the Creative Commons Attribution (CC BY) license to manuscripts we publish. This license was developed to facilitate open access – namely, free immediate access to, and unrestricted reuse of, original works of all types. Under this license, authors agree to make articles legally available for reuse, without permission or fees, for virtually any purpose. Anyone may copy, distribute or reuse these articles, as long as the author and original source are properly cited.
Main Article Content
Synthesis of Indoles: Tetrahydropyrazino[1,2-a]indole-1,4-dione and Pyrazino[1,2-a]indole-6,13-diones from Piperazine-2,5-diones
Abstract
The readily available piperazine-2,5-dione has been used to prepare both 1:1 (1–3), with stereotopic methylene protons; and 2:1 (4–6) arylmethylenepiperazine-2,5-diones in above average yields. The halo-derivatives, 1, 4 and 5 were cyclized to pyrazino[1,2-a]indoles, 7–9, using copper bronze. Indole compounds 7 and 9 were further treated, separately, with lithium aluminium hydride, sodium borohydride, lithium hydroxide monohydrate and butyl lithium to yield 2-substituted indoles 10–13.
Keywords: Indoles, piperazine-2,5-diones, arylaldehydes, 1:1 adducts, 2:1 adducts.
