Borylated Dibenzoborepin: Synthesis by Skeletal Rearrangement and Photochromism Based on Bora‐Nazarov Cyclization†
This work was partly supported by CREST, JST, and a Grant‐in‐Aid for Scientific Research on Innovative Areas (Stimuli‐responsive Chemical Species, No. 24109007) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. A. I. expresses her gratitude to the JSPS research fellowship for young scientists.
Abstract
It's a boron kind of magic: A complex reaction sequence involving a skeletal rearrangement leads to 10‐dimesitylboryl‐substituted dibenzoborepin in a one‐pot transformation in good yield. The borylborepin shows remarkable photochromic properties and undergoes a bora‐Nazarov cyclization to give a deep‐blue compound with an allyl cation‐like CBC substructure.
