2',3',5'-tri-O-(tert-butyldimethylsilyl)guanosine 、
levulinic acid pentafluorophenyl ester 在
正丁基锂 作用下,
以
四氢呋喃 为溶剂,
反应 30.0h,
以20%的产率得到4-Oxo-pentanoic acid {9-[(2R,3R,4R,5R)-3,4-bis-(tert-butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-6-oxo-6,9-dihydro-1H-purin-2-yl}-amide