methyl 2-(tert-butoxy)-2-(6-methyl-4-(5-methylchroman-6-yl)-7-oxo-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetate 、
4-溴甲基四氢吡喃 以was isolated as beige solid after reverse phase chromatography (45%)的产率得到2-(tert-butoxy)-2-(6-methyl-4-(5-methylchroman-6-yl)-7-oxo-1-((tetrahydro-2H-pyran-4-yl)methyl)-6,7-dihydro-1H-pyrrolo[2,3-c]pyridin-5-yl)acetic acid