1. Fused indoles. 1. Synthesis of the 1,9-dihydrothiazino[3,4-b] indole ring system
2. The 2-chloro-l-ethylindole-3-carboxaldehyde was not isolated.
3. The 2-chloro-l-methylindole-3-carboxaldehyde was not isolated.
4. No attempts were made to search for further compounds in the reaction mixture.
5. Varian NMR Spectra Catalog, Vol. 1.