Synthesis of Silylated Cyclobutanone and Cyclobutene Derivatives Involving 1,4‐Addition of Zinc‐Based Silicon Nucleophiles
作者:Ming Cui、Martin Oestreich
DOI:10.1002/chem.202102993
日期:2021.11.22
intermediate metal enolate can be trapped as an enol phosphate and further reacted with Grignard reagents in Kumada cross-coupling reactions. By this, a range of silylated cyclobutanone and cyclobutenederivatives becomes accessible.
A novel rhodium-catalyzed synthesis of substituted phenols by the ring-opening reaction of cyclobutenones with alkynes as well as electron-deficient alkenes has been developed. Both reactions involve C–C bond cleavage of cyclobutenones, and an (η4-vinylketene)rhodium complex rather than a rhodacyclopentenone is considered to be a key intermediate.
Boosting the Enantioselectivity of Conjugate Borylation of α,β‐Disubstituted Cyclobutenones with Monooxides of Chiral
<i>C</i>
<sub>2</sub>
‐Symmetric Bis(phosphine) Ligands
作者:Ming Cui、Zhi‐Yuan Zhao、Martin Oestreich
DOI:10.1002/chem.202202163
日期:2022.11.7
A chiral bis(phosphine) monooxide (BPMO) derived from a C2-symmetric bis(phosphine) ligand does magic to the copper-catalyzed conjugate borylation of α,β-disubstituted cyclobutenones. Yields and levels of stereoselection, especially enantioselectivity, are exceedingly high (see scheme).