Intramolecular Capture of a Cyclobutylthionium Ion for the Synthesis of New Strained Heterocycles and Carbocycles: A Rapid Assembly of the BCD Ring Sequence of Penitrems
The first example of intramolecular interception of a cyclobutyl thionium ion for the synthesis of cyclobutathiochromenes, hexahydrocyclobutaquinolines and hexahydrocyclobutanaphthalenes is reported.