Carbazole Based Smaragdyrins: Synthesis, Aromaticity Switching, and Formation of a Spiro-Dimer

Chem Asian J. 2024 Mar 8:e202400029. doi: 10.1002/asia.202400029. Online ahead of print.ABSTRACTCarbazole-incorporated smaragdyrin BF2-complex 3 was synthesized by SNAr reaction of 3,5-dibromo-8-mesityl-BODIPY 1 with 3,6-di(tert-butyl)-1,8-di(pyrrol-2-yl)carbazole 2 as a nucleophile. Demetalation of 3 with ZrCl4 gave the corresponding smaragdyrin free base 4 in a good yield. Oxidations of 3 and 4 with MnO2 gave smaragdyrins 5 and 6, respectively, both followed by aromaticity switching, since the oxidized products showed a moderate paratropic ring current owing to their 20π-electronic circuits. Further, treatment of 4 with [RhCl(CO)2]2 in the presence of NaOAc gave RhI complex 7, and oxidation of 3 with RuCl3 in the presence of triethylamine led to the formation of a spiro dimer product, 8.PMID:38458988 | DOI:10.1002/asia.202400029

Source: Chemistry, an Asian Journal - March 8, 2024 Category: Chemistry Authors: Jinchao Chen Haigen Nie Yutao Rao Ling Xu Mingbo Zhou Bangshao Yin Jianxin Song Atsuhiro Osuka Source Type: research