7,7-Dimethyltricyclo[3.3.0.02,8]octan-3-ones as synthetic intermediates. IV. A further examination of cyclopropane ring opening in the tricyclo[3.3.0.02,8]octan-3-one system.
7,7-Dimethyltricyclo[3.3.0.02,8]octan-3-ones as synthetic intermediates. IV. A further examination of cyclopropane ring opening in the tricyclo[3.3.0.02,8]octan-3-one system.
The cyclopropane ring opening reaction of several tricyclo[3.3.0.02, 8]octan-3-ones (8a-c) was examined. Under acid-catalyzed substitutional conditions, compounds 8a and 8b gave predominantly the bicyclo[3.2.1]octan-3-one derivatives (9a, b), while compound 8c afforded exclusively the bicyclo[3.3.0]octan-3-one (10c). A candidate precursor for the synthesis of quadrone, 13, was also successfully prepared.