Lithium diisopropylamide-mediated carbolithiation reactions of vinylidenecyclopropanes and further transformations of the adducts.
Highly stereo- and regioselective carbolithiation reactions of vinylidenecyclopropanes 1 were realized by treatment with lithium diisopropylamide (LDA) in THF and by quenching with various electrophiles such as aryl or aliphatic aldehydes, ketones, enones or propargyl bromide. Transformation of these adducts such as vinylcyclopropenes and allenols was also performed in the presence of Lewis acid or Brønsted acid to provide the fused and conjugated aromatic products in good to high yields under mild conditions.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China.
Jian-Mei
JM
Lu
Min
M
Shi