Stereoselective Synthesis of P-Chirogenic Dibenzophosphole–Boranes via Aryne Intermediates
摘要:
A new aryne-mediated tandem cross-coupling/P-cyclization sequence starting from tertiary phosphine-boranes and 1,2-dibromobenzenes is reported. P-chirogenic dibenzophospholes become accessible in a regio-, chemo-, and diastereoselectiye way.
Formal Halogen Transfer of Bromoarenes via Stepwise Reactions
作者:Kengo Inoue、Atsunori Mori、Kentaro Okano
DOI:10.1021/acs.orglett.3c02540
日期:2023.9.15
A two-step halogen transfer of bromoarenes is reported. Mono-, di-, and tribromoaryllithiums generated through deprotonative lithiation were converted into organozinc species by in situ zincation, which were then subjected to bromination to provide the corresponding di-, tri-, and tetrabromoarenes, respectively, in 41–95% yields. Regioselective bromine–magnesium exchange with ethylmagnesium chloride