Bioinspired Syntheses of the Pyridoacridine Marine Alkaloids Demethyldeoxyamphimedine, Deoxyamphimedine, and Amphimedine
摘要:
Efficient bioinspired syntheses of the biologically active pyridoacridine marine alkaloids demethyldeoxyamphimedine, deoxyamphimedine, and amphimedine are reported. Reaction of styelsamine D, prepared via an optimized route starting from Boc-dopamine, with paraformaldehyde afforded demethyldeoxyamphimedine and deoxyamphimedine. Oxidation of the latter using either K-3[Fe(CN)(6)] or DMSO/conc. HCl gave amphimedine in 8 steps from tryptamine with an overall yield of 14%. The versatility of the method was demonstrated by the synthesis of non-natural ethyl and benzyl congeners of deoxyampbimedine and amphimedine.
Bioinspired Syntheses of the Pyridoacridine Marine Alkaloids Demethyldeoxyamphimedine, Deoxyamphimedine, and Amphimedine
摘要:
Efficient bioinspired syntheses of the biologically active pyridoacridine marine alkaloids demethyldeoxyamphimedine, deoxyamphimedine, and amphimedine are reported. Reaction of styelsamine D, prepared via an optimized route starting from Boc-dopamine, with paraformaldehyde afforded demethyldeoxyamphimedine and deoxyamphimedine. Oxidation of the latter using either K-3[Fe(CN)(6)] or DMSO/conc. HCl gave amphimedine in 8 steps from tryptamine with an overall yield of 14%. The versatility of the method was demonstrated by the synthesis of non-natural ethyl and benzyl congeners of deoxyampbimedine and amphimedine.
Phosphorous pentoxide-pyridine: A new combination for Bischler-Napieralski reaction
作者:Nobuo Itoh、Shigehiko Sugasawa
DOI:10.1016/0040-4020(57)85009-1
日期:1957.1
The Bischler-Napieralski type of cyclisation can be effected by treating appropriately substituted acyl β-phenethylamides with phosphorous pentoxide in boiling pyridine. Isoquinolines can be recovered as the free base from the resultant pyridine layer; this reaction gives a good yield.