ired compound as a colored solid.

4.1.3  N-{[(4R,6R)-6-(6-amino-9H-purin-9-yl)-2,2-dimethyl-tetrahydro-2H-furo[3,4-d] [1,3]dioxol-4-yl]methyl}-4-nitrobenzene-1-sulfonamide (18)
Following method A with 5′-amino-2′,3′-isopropylidene adenosine (