Pteridine. Teil LXXIX. Synthese, Reaktionen und Photochemie heterocyclischer N,‐Alkylthioamide

Abstract

Synthesis, Reactions, and Photochemistry of Heterocyclic N-AlkylthioamidesVarious heterocyclic N-alkylthioamides of the pteridine (2,7) and pyridine series (13) have been synthesized and investigated regarding their photooxidation. The compounds are very photolabil under aerobic conditions and are converted into the corresponding amides (1,6 and 12, resp.) on irradiation.

A novel tandem cyclization of condensed 2,3-dialkynylpyrazines into [1,2,3]triazolo[1′,5′;1,2]pyrido[3,4-b]pyrazines promoted by sodium azide

“…4.7.1. 9,2,3]triazolo[1 0 ,5 0 ;1,2]pyrido [4,3-g] 7,30.6,115.4,127.9,128.5,129.2,129.3,129.9,130.0,130.2,130.6,131.1,131.4,138.9,139.5,140.9,146.4,146.7,150.7,159.7;IR (Nujol) 3.94;N,22.52. Found: C,66.02;H,4.15;N,2,3]triazolo[1 0 ,5 0 ;1,2]-pyrido [4,3-g]pteridine-8,10(9H,11H)-dione 9b.…”

Pteridines. Part LXXXV. Chemical synthesis of deoxysepiapterin and 6‐acylpteridines by acyl radical substitution reactions

“…of 0.4 g (1.9 mmol) of 18 and 3 g of dihydrocinnamaldehyde in 90 ml of 80% AcOH soh. are added simultaneously and dropwise within 10 min 5 g of FeS0,.7 HzO in 20 ml of H 2 0 and 3 g of tert-butyl hydroperoxide at r.t. After stirring for 30 -2-(dimethylamino)-7-(methylthio)-6-(3-phenylpropionyl)pteridine (27). In a mixture of 25 ml of AcOH, 10 ml of H20, and 0.2 ml of conc.…”

Pteridines. Part XCVII. Synthesis and properties of 6‐thioxanthopterin and 7‐thioisoxanthopterin

“…7-Thioisoxanthopterin (15). Compound 14 (0.5 g, 1.9 mmol) [25] in 20 ml of 1~ NaOH was heated in boiling H 2 0 for 1 h. After treatment with a little charcoal and filtration, the hot filtrate was added dropwise to boiling dil. AcOH.…”