M. Haidoune et R. Mornet, SYNTHESIS OF 6-(PYRROL-1-YL)PURINE AND OF SOME OF ITS 9-GLYCOSIDES, Journal of heterocyclic chemistry, 31(6), 1994, pp. 1461-1464
Adenine reacts slowly with 2,5-dimethoxytetrahydrofuran (3) in a dilut
e acetic acid solution in methanol-water, to give 6(pyrrol-1-yl)purine
(4). Under more acidic conditions, 4 is partly transformed to 6-(indo
l-1-yl)purine (5) and other unidentified products. The reaction may be
used for the preparation of 9-glycosides of 4 from the corresponding
adenine derivatives provided their 9-glycosyl linkage is somewhat resi
stant to acid hydrolysis.