Asymmetric addition of arylboronic acids to α,β-unsaturated sulfonyl compounds proceeded in the presence of a rhodium catalyst coordinated with a chiral diene ligand to give high yields of the addition products with high enantioselectivity (96->99.5% ee). The diene ligand was proved to be essential for the formation of the addition products, while the use of a bisphosphine ligand mainly gave the cine-substitution
One-pot approach for the regioselective synthesis of β-keto sulfones based on acid-catalyzed reaction of sulfonyl chlorides with arylacetylenes and water
Reaction of sulfonylchlorides with arylacetylenes and water in the presence of a catalytic amount of sulfonic acid in THF provided β-keto sulfones in good yields with excellent regioselectivity.
Enantioselective 1,4-addition of cyclopropylboronic acid catalyzed by rhodium/chiral diene complexes
作者:Ryosuke Takechi、Takahiro Nishimura
DOI:10.1039/c5cc02140e
日期:——
cyclopropylboronic acids to electron-deficient alkenes such as alkenylsulfones, enones, enoates, and nitroalkenes proceeded to give high yields of the corresponding 1,4-addition products with high enantioselectivity.
One-pot synthesis of sulfonyl dibenzosuberdiones <i>via</i> In(OTf)<sub>3</sub>-promoted double Friedel–Crafts reactions of oxygenated arylacetic acids with β-arylvinyl sulfones
作者:Meng-Yang Chang、Chun-Yi Lin
DOI:10.1039/d3ob00149k
日期:——
sulfonyl dibenzosuberdiones is developed via In(OTf)3-promoted tandem double Friedel–Crafts reactions of oxygenated arylacetic acids with β-arylvinyl sulfones. A plausible mechanism is proposed and discussed in detail. This protocol allows for highly effective sequential intermolecular Michael addition, intramolecular ring-closure and α-benzylic oxidation via the formation of two carbon–carbon single
Synthesis of sulfonyl 2-aryl-5-methylenyltetrahydropyrans
作者:Meng-Yang Chang、Kuan-Ting Chen
DOI:10.1039/d3ra06370d
日期:——
research describes a high-yield method for the synthesis of sulfonyl 2-aryl-5-methylenetetrahydropyrans by one-pot straightforward DABCO-promoted intramolecular Michael addition of β-sulfonyl styrene with 2-chloromethyl-1-propenol followed by intramolecularalkylation. This Baylis–Hillman-type pathway provides a highly effective stereoselective annulation by forming one carbon–oxygen bond and one carbon–carbon