Reaction of adenallene (4a) with methanesulfonyl chloride in pyridine afforded 4'-chloro-4'-deoxyadenallene (6a). A similar reaction with toluene-4-sulfonyl chloride (NEt3, CH2Cl2) led to elimination of the unsaturated moiety and formation of N9-(4-toluenesulfonyl)adenine (8a). Michaelis-Arbuzov reaction of E- and Z-unsaturated chlorides 13a and 16b with triethyl phosphite afforded phosphonates 14a and 17b. Dealkylation of the latter products, coupled in case of 17b with acid hydrolysis, led to phosphonic acids 15a and 18. By contrast, Michaelis-Arbuzov reaction with butynyl chlorides 19a and 19b led to elimination of unsaturated moiety and alkylation of the released heterocyclic bases to give N9-ethyl derivatives 20a and 20b. In the presence of iodide ion, N9-(2,3-butadien-1-yl)adenine (30a, from 19a) and/or unsaturated diphosphonates 25a and 25b were obtained. The Michaelis-Arbuzov reaction of chloroallene 6a led to 2'-phosphonate 33a which, after dealkylation, afforded phosphonic acid 35a. When iodide ion was present, both 2'- and 4'-phosphonates 33a and 36a were obtained. Compound 36a was also prepared by Michaelis-Becker reaction of chloroallene 6a with sodium diethyl phosphite in THF-HMPA. In DMSO, both phosphonates 33a and 36a were formed. Under similar conditions (DMF), chlorobutyne 19a gave 4'-phosphonate 36a. Dealkylation of 36a furnished phosphonic acid 37a. Adenallene (4a) and diethyl chlorophosphite in pyridine afforded phosphonate 33a whereas butynol 39a afforded only adenine (10a). The probable reaction course of these transformations and spectral properties of the reaction products will be discussed.
The synthesis of novel 6-chloro/morpholino/amino/-9-sulfonylpurine derivatives was accomplished in two ways, either (i) involving the condensation reaction of 6-chloropurine with commercially available arylsulfonyl chlorides in acetone and the presence of aqueous KOH at 0 °C, followed by the substitution of C6-chlorine with morpholine, or (ii) employing a reversed synthetic approach where 6-morpholinopurine
A Dinuclear Copper(II) Complex with Adeninate Bridge Ligands and Prominent DNA Cleavage Activity. Structural and Spectroscopic Characterization and Magnetic Properties
作者:José Luis García-Giménez、Gloria Alzuet、Marta González-Álvarez、Alfonso Castiñeiras、Malva Liu-González、Joaquín Borrás
DOI:10.1021/ic700751j
日期:2007.8.1
A new dinuclearcopper(II) complex has been synthesized and structurallycharacterized: [Cu(mu-ade)(tolSO3)(phen)]2.2H2O (Hade = adenine, tolSO3- = toluenesulfonate anion). Its magnetic properties and electronic paramagnetic resonance (EPR) spectra have been studied in detail. The compound has two metal centers bridged by two adeninate NCN groups. The coordination geometry of the copper(II) ions in