Catalytic Allylation of Aldehydes Using Unactivated Alkenes
作者:Shun Tanabe、Harunobu Mitsunuma、Motomu Kanai
DOI:10.1021/jacs.0c04735
日期:2020.7.15
and a chromium complex catalyst, enabling catalytic allylation of aldehydes with simplealkenes, including feedstock lower alkenes. The reaction proceeded under visible-light irradiation at room temperature and with high functional group tolerance. The reaction was extended to an asymmetric variant by employing a chiral chromium complex catalyst.
diastereoselective. The allylation of benzaldehyde by 1-chlorobut-2-ene in 1,3-dimethylimidazolidin-2-one (DMI) does not occur with tin(II) chloride or bromide but does proceed with tin(II) iodide and exhibits gamma-syn selectivity which is unusual for a Barbier-type carbonylallylation. In the carbonylallylation by 1-chlorobut-2-ene with any tin(II) halide, the addition of tetrabutylammoniumiodide (TBAI) accelerates
1-Substituted or 3-substituted prop-2-en-1-ols cause syn-diastereoselective carbonyl allylation with tin(II) iodide and tetrabutylammonium iodide via the formation of 3-substituted prop-2-enylpolyiodotins to produce syn-1,2-disubstituted but-3-en-1-ols.
(E)-rich 1-Bromo-2-butene preferentially caused γ-syn-allylation of aldehydes with tin(II) iodide and tetrabutylammoniumbromide (or iodide) in THF-H2O or 1,3-dimethyl-2-imidazolidinone-H2O to produce 1-substituted syn-2-methyl-3-buten-1-ols.