5'-fluoro-5,6-dihydrospiro[benzo[1,2-b:5,4-b]difuran-3,3'-indol]-2'(1'H)-one 、 3-methylspiro[furo[3,2-f][1,2]benzisoxazole-5,3'-indol]-2'(1H)-one 、
(R)-(tetrahydrofuran-2-yl)methyl 4-methylbenzenesulfonate 、
2-溴甲基-5-三氟甲基呋喃 以5′-fluoro-1′-[(2R)-tetrahydrofuran-2-ylmethyl]-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one was obtained (60%) as a colorless solid的产率得到5'-fluoro-1'-[(2R)-tetrahydrofuran-2-ylmethyl]-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one