Lithiation of 1-alkoxyindoles, 3-dimethylaminomethyl- and 3-dimethylaminoethyl-1-methoxyindole occurred regioselectively at the 2-position. The introduction of a sterically bulky group into the 2-position of 3-dimethylaminomethyl-1-methoxyindoles directed the lithiation to the 4-position.
Lithiation of 1-alkoxyindoles, 3-dimethylaminomethyl- and 3-dimethylaminoethyl-1-methoxyindole occurred regioselectively at the 2-position. The introduction of a sterically bulky group into the 2-position of 3-dimethylaminomethyl-1-methoxyindoles directed the lithiation to the 4-position.
A Regioselective Lithiation of 1-Methoxymethoxyindole at the 2-Position and Its Application for the Synthesis of 2-Substituted Indoles
作者:Masanori Somei、Tetsuya Kobayashi
DOI:10.3987/com-92-6066
日期:——
A regioselective lithiation of 1-methoxymethoxyindole at the 2-position was achieved with n-BuLi at 0-degrees-C. Subsequent treatment with electrophiles afforded 2-substituted 1-methoxymethoxyindoles, which were readily converted to 2-substituted indoles.
Lithiation of 1-alkoxyindoles, 3-dimethylaminomethyl- and 3-dimethylaminoethyl-1-methoxyindole occurred regioselectively at the 2-position. The introduction of a sterically bulky group into the 2-position of 3-dimethylaminomethyl-1-methoxyindoles directed the lithiation to the 4-position.