1-deoxy-1-hydrazino-2,3-O-isopropylidene-D-ribofuranose 、
2-Hydroxy-2-<(1R)-4,7,7-trimethyl-3-oxobicyclo<2.2.1>hept-2-ylidene>acetic acid 以
甲醇 为溶剂,
以85%的产率得到(4S,7R)-1-(2,3-O-isopropylidene-β-D-ribofuranosyl)-7,8,8-trimethyl-4,5,6,7-tetrahydro-4,7-methano-1H-indazole-3-carboxylic acid