2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2(1'H)-one   、                                                                                      
(8S)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one   、                                                                                      
3,5-二氟溴苄   、                                                                                      
1-溴戊烷                                                                                                                                                                                                                                                                                                          以1′-(3,5-difluorobenzyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (72%) as a colorless solid的产率得到1'-(3,5-difluorobenzyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one