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netLibrary - eBook Summary Structure-based Drug Design by ...

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e Guanine base.<br />

Source: Ref. 27.<br />

with a two-carbon spacer was a much better PNP inhibitor; however, it was clear from x-ray analysis<br />

that the aromatic ring was unable to form the ideal “herringbone” packing interaction.<br />

Alternatively, compounds were modeled in which the spacer to the phosphate binding site branched<br />

from the benzylic carbon, thus placing no restrictions on the tilt of the aromatic ring. Examination of the<br />

9-benzyl-9-deazaguanine/PNP complex indicated that of the two benzylic positions, one (pro-R) pointed<br />

into a sterically crowded area within the active site, whereas the other (pro-S) pointed into a relatively<br />

empty space adjacent to the phosphate binding site. This analysis led to the synthesis of racemic 9-[1-(3chlorophenyl)-2-carboxyethyl]-9-deazaguanine.<br />

This compound adds an acetate group (CH 2COO-) to<br />

the methylene carbon atom that joined 9-deazaguanine to the chlorinated benzene ring. This compound<br />

was resolved into its (S) and (R) enantiomers.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_165.html (2 of 2) [4/5/2004 5:02:28 PM]

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