Synthesis of Substituted Dihydrobenzofurans via Tandem S<sub>N</sub>Ar/5-<i>Exo-Trig</i> Cyclization
作者:Maximilian Koy、Keary M. Engle、Lawrence M. Henling、Michael K. Takase、Robert H. Grubbs
DOI:10.1021/acs.orglett.5b00743
日期:2015.4.17
SNAr/5-exo-trig cyclizationreaction is reported that converts N-alkyl- and -arylimines derived from o-fluorobenzaldehydes into 3-amino-2,3-dihydro-2,2-diarylbenzofurans in moderate to good yields. Diarylmethoxide coupling partners serve the dual role of nucleophile in the SNAr step and catalytic base in the cyclization step. With a subset of the substrates, a further base-induced elimination of the