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An enzymatically cleavable ester functionality was readily introduced in proximity to the C4 stereogenic center at N3 by hydroxymethylation with formaldehyde,
followed by standard acetylation with acetyl chloride.
     The resulting N3-acetoxymethyl activated DHPM (rac)-6 was obtained in ca. 80% overall yield and high purity from 4 as a single regioisomer (no N1- or bis-functionalized products could be detected).

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huchengc(½ð±Ò+29): 2010-09-27 12:20:52
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huchengc(½ð±Ò+1, ·­ÒëEPI+1): 2010-09-27 12:20:37
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