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200517.fm Page 180 Friday, March 18, 2005 2:52 PM
2005
Purine derivatives
R 0540
Regioselectivity in Cross-Coupling Reactions of 2,6,8-Trichloro-9-(tetrahydropySynthesis of 2,6,8-Trisubstituted Purine Bases. — The regiose17- 161 ran-2-yl)purine:
lectivity in the reactions of trichloropurine (II) with methyl metal reagents or phenylboronic acid is studied under different reactions conditions. It allows the synthesis of
differentially 2,6,8-trisubstituted 9-Thp protected purines. A method for the cleavage
of the Thp group is also described. — (HOCEK*, M.; POHL, R.; Synthesis 2004, 17,
2869-2876; Inst. Org. Chem. Biochem., Czech. Acad. Sci., CZ-166 10 Prague,
Czech Republic; Eng.) — Mais
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