Synthesis of Intermediate 19 polyphosphoric NHNH OMe Fischer indole OMe synthesis 24: phenylhydrazine 25: acetoveratrone OMe [3,3] H2N OMe OMe OMe OMe.NH3 OMe H④ OMe 23: 2-veratrylindole CH2o, Me2NH H2O-dioxane,(92% AcOH 1. Mel 2. NaCN. DMF OMe (97% overall) LAH4,THF,△(85% NH? CHO 21: ethyl glyoxylate OMe 20: 2-veratryltryptamineSynthesis of Intermediate 19