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OON,N-DEA(98%)O2+OROR1) Claisen Rearrangement of 4-Allyloxy-1-p-methoxybenzylpyrazole and Synthesis of Pyrazole-Fused 7-Membered Lactones, Heterocycles, 2021, 103, 980-994.2) Synthesis of 2-Amino-1,3-benzoselenazole via Metal-Free Cyclization from Isothiocyanate and Bis(o-Aminophenyl)diselenide, Heterocycles, 2020, 101, 444-451.3) Divergent Synthesis of Withasomnines via Synthesis of 4-Hydroxy-1H-pyrazoles and Claisen Rearrangement of Their 4-O-Allylethers, Tetrahedron Lett., 2011, 52, 4448 - 4451.4) Facile and Efficient Synthesis of Naturally Occurring Carbasugars (+)-Pericosines A and C, Org. Lett., 2009, 11, 2699 – 2701.5) Synthesis of Novel Organoselenium as Catalyst for Baeyer-Villiger Oxidation with 30% H2O2, Tetrahedron Lett. 2005, 46, 8665 – 8668.Fig. 1. Regio-selective Claisen rearrangement and ring size-selective hydrolactonizationFig. 2. Metal-free cyclization of bis(o-aminophenyl)diselenide and isothiocyanatesHayato Ichikawa is an associate professor at the Department of Applied Molecular Chemistry, College of Industrial Technology Nihon University. He earned his bachelor’s and master’s degrees in engineering from Iwate University in 1996 and 1998, respectively, and his PhD in science from Hokkaido University in 2001 under the supervision of Professor Keiji Maruoka. After a research period with Professor Duy Hua at Kansas State University, he joined Osaka University of Pharmaceutical Sciences as an assistant professor in 2002. In 2009, he moved to the Nihon University. His main research fields are the development of synthetic methods for heterocyclic compounds and a new synthesis using organoselenium compounds. He is a member of the American Chemical Society (ACS), the Chemical Society of Japan (CSJ), the Pharmaceutical Society of Japan (PSJ), the Society of Synthetic Organic Chemistry, Japan (SSOCJ), and the Kinka Chemical Society (KCS). Dr. Ichikawa received the 2008 Lonza Japan Award and the 2002 Young Presentation Award of the Society of Synthetic Organic Chemistry, Japan.－　　－18up to 99%17 examplesNNPMBSeNH2NCSOHNNPMBCHCl3, reflux, 24 hPd(OAc)2 (2.0 mol%)DPE-phos (8.0 mol%)CO/H2, 40 atmCH2Cl2(89%)NNPMBSeNNHResearch AchievementsHayato ICHIKAWAAssociate Professor, Department of Applied Molecular Chemistry