吉田 和弘

Cyclam is a well‐known example of a polyaza macrocycle. However, there are few reports of its optically active versions. In this study, we synthesized highly symmetric optically active cyclam (S,S,S,S)‐5,7,12,14‐tetraphenyl‐1,4,8,11‐tetraazacyclotetradecane, which has four phenyl groups on the cyclam skeleton, and derivatized it in various ways. We were able to synthesize a chiral Cu complex, an N‐ethyl derivative, and a dithiourea from this optically active cyclam. The structures of the chiral Cu complex and dithiourea were verified by single‐crystal X‐ray diffraction analysis.

Abstract [1]Benzothieno[3,2‐b][1]benzothiophenes (BTBTs) are important molecules that have been extensively studied as high‐performance organic field‐effect transistors (OFETs). Therefore, it is important to develop a simple synthetic method for these molecules. In this paper, a synthetic method to obtain the BTBTs from 2‐arylbenzo[b]thiophenes and elemental sulfur, in which two C−S bonds are formed at once, is described. In this method, molecular iodine plays a very important role as an additive. The role of iodine is discussed in the presumed reaction pathways.