(R)-3,7-dihydro-2H-spiro[benzofuro[5,6-b][1,4]dioxine-8,3'-indolin]-2'-one 、
(8S)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one 以(R)-1′-pentyl-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (74%) as a colorless solid的产率得到(R)-1'-pentyl-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one