Nanoporous Gold-Catalyzed [4+2] Benzannulation between ortho-Alkynylbenzaldehydes and Alkynes - Asao, Naoki; Menggenbateer; Seya, Yohei; Yamamoto, Yoshinori; Chen, Mingwei; Zhang, Wei; Inoue, Akihisa (Synlett, 2012)