占吨酮 、
diethyl (5-(5,6-dihydro-[1,3]dithiolo[4,5-b][1,4]dioxin-2-ylidene)-[1,3]dithiolo[4,5-d][1,3]dithiol-2-yl)phosphonate 在
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
以17%的产率得到2-(2-Xanthen-9-ylidene-[1,3]dithiolo[4,5-d][1,3]dithiol-5-ylidene)-5,6-dihydro-[1,3]dithiolo[4,5-b][1,4]dioxine