Lewis Acid Catalyzed Rearrangement of Vinylcyclopropenes for the Construction of Naphthalene and Indene Skeletons

The choice of Lewis acid catalyst can result in dramatic differences in the chemoselectivity of the rearrangement reactions of vinylcyclopropenes.
When BF3·OEt2 was used as the catalyst, naphthalenes were formed. However, when Cu(OTf)2 was used as the catalyst, indenes were obtained.

路易斯酸催化剂（Lewis acid catalyst）的选型会对乙烯基环丙烯（vinylcyclopropenes）重排反应的化学选择性造成显著影响。当以三氟化硼乙醚络合物（BF3·OEt2）为催化剂时，反应生成萘类化合物；而当采用三氟甲磺酸铜（Cu(OTf)2）作为催化剂时，则可得到茚类化合物。