Tania Jiménez, Javier Carreras, Julien Ceccon, and Antonio M. Echavarren
The gold(I)-catalyzed intramolecular reaction of allenes with oxoalkenes leads to bicyclo[6.3.0]undecane ring systems, although in the case of terminally disubstituted allenes, seven-membered rings are formed. The related intermolecular addition of aldehydes to allenenes also gives seven-membered rings.
Org. Lett. 2016, 23, 18, 1410–1413; doi: 10.1021/acs.orglett.6b003426