1-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)indoline-2,3-dione 、
5-溴-7-氮杂氧化吲哚 在
对甲苯磺酸 作用下,
以
甲苯 为溶剂,
以55%的产率得到(2R,3R,4S,5R,6R)-2-(acetoxymethyl)-6-(3-(5-bromo-2-oxo-1,2-dihydro-3H-pyrrolo[2,3-b]pyridin-3-ylidene)-2-oxoindolin-1-yl)tetrahydro-2H-pyran-3,4,5-triyl triacetate