2-溴甲基吡啶 、
2-(bromomethyl)tetrahydro-2H-pyran 、
6-chloro-2,3-dihydrospiro[furo[3,2-f][1,4]benzodioxine-9,3'-indol]-2'(1'H)-one 、 5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one 以6-chloro-1′-(pyridin-2-ylmethyl)-2,3-dihydrospiro[furo[3,2-f][1,4]benzodioxine-9,3′-indol]-2′(1′H)-one was obtained (81%) as a colorless solid的产率得到6-chloro-1'-(pyridin-2-ylmethyl)-2,3-dihydrospiro[furo[3,2-f][1,4]benzodioxine-9,3'-indol]-2'(1'H)-one