of racemic and branched monosubstituted allylicacetates by a ruthenium-catalyzed regioselective allylic etherification. The reaction was effectively catalyzed by the chiral ruthenium catalyst, which was generated by [RuCl2(p-cymene)]2 and (S,S)-iPr-pybox and a catalytic amount of TFA, and both the allylic etherification product and recovered allylicacetate were obtained as an enantiomerically enriched
Enantioselective Iridium-Catalyzed Phthalide Formation through Internal Redox Allylation of Phthalaldehydes
作者:James M. Cabrera、Johannes Tauber、Michael J. Krische
DOI:10.1002/anie.201712015
日期:2018.1.26
An inside job: Enantioselective phthalide synthesis was achieved through internal redox allylation of o‐phthalaldehydes. Oxidative esterification is balanced by reductive carbonyl addition to achieve an overall redox‐neutral process. This method enabled formal syntheses of ent‐spirolaxine methyl ether and CJ‐12,954.
Iridium-catalyzed allylic alkylation of monosubstituted allylic acetates with azlactone, and separation of diastereoisomers by sequential aza-Cope rearrangement
The iridium-catalyzedallylicalkylation with azlactone and sequential aza-Cope rearrangement was demonstrated. The sequential reaction was effective in separating of diastereoisomers and afforded a diastereomerically pure azlactone derivative and oxazolinone derivative.
A Pd-catalyzed multicomponent cross-coupling of allyl esters with alkyl bromides to synthesize allylic sulfones by using K2S2O5 as a connector is first reported. The reaction displays a broad range of substrate generality along with excellent functional group compatibility and produces the products with high regioselectivity (only E). Furthermore, the biologically active molecules with a late-stage
首次报道了以K 2 S 2 O 5作为连接剂,Pd催化烯丙基酯与烷基溴多组分交叉偶联合成烯丙基砜。该反应显示出广泛的底物通用性以及优异的官能团兼容性,并产生具有高区域选择性的产物(仅E)。此外,经过后期修饰的生物活性分子,包括阿司匹林、薄荷醇、冰片、雌酮等,也与多组分交叉偶联反应高度相容。机理研究表明SO 2插入C-Pd 键的过程参与了这一转变。