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168 Bull. Korean Chem. Soc . 2002, Vol. 23, No. 1 Notesat δ 51.35 and 80.78 ppm for two methylene groups of 6.Use of the electron-rich benzylsulfamide 4b and 4c in placeof 4a gave the double intramolecular α-sulfamidoalkylationproducts 7a and 7b in 45% and 67%, respectively. Analysisof 7b by X-ray crystallography confirmed the 6,13-sulfono-dibenzo-[c,h][1,6]-diazecine ring structure. ORTEP view of7b is presented in Figure 1. The triclinic unit cell containstwo parts of independent molecules. In the

α-Sulfamidoalkylation Reaction: Synthesis of 6,13-Sulfonodibenzo-[c,h][1,6]-diazecines