Enantioselective Synthesis of Chiral‐at‐Sulfur 1,2‐Benzothiazines by Cp<sup>x</sup>Rh<sup>III</sup>‐Catalyzed C−H Functionalization of Sulfoximines
作者:Yang Sun、Nicolai Cramer
DOI:10.1002/anie.201810887
日期:2018.11.19
attractive structural motifs in drug discovery. A direct catalytic enantioselective method for the synthesis of sulfur‐chiral 1,2‐benzothiazines from readily accessible diaryl sulfoximines is presented. Rhodium(III) complexes equipped with chiral cyclopentadienyl ligands and paired with suitable carboxylic acid additives engage in an enantiodetermining C−H activation directed by the sulfoximine group. Subsequent
Visible-Light-Induced Catalysis: A Regioselectivity Switch between [2+1] and [2+2] Cycloaddition of Diazocarbonyls with Olefins
作者:Jian Lv、Huixin Qiu、Lirong Wen
DOI:10.1055/a-1786-6496
日期:2022.9
Visible-light-promoted [2+1] and [2+2] cycloadditionreactions of diazocarbonyls with olefins have been developed, affording functionalized cyclopropanes and cyclobutanes, respectively. In visible-light catalysis of Ir(ppy)3, a simple addition of Rh2(OAc)4 switches the regioselectivity from [2+1] to [2+2] cycloaddition with good reactivity and high regioselectivity.
Matching Carbenes and Sulfoximines
<i>via</i>
Ketenes Generated from
<i>α</i>
‐Diazoketones by Blue Light
作者:Shulei Pan、Marco T. Passia、Xianliang Wang、Peng Wu、Ding Ma、Carsten Bolm
DOI:10.1002/adsc.202201274
日期:2023.1.10
Although NH-sulfoximines are known to react with carbenes by deamidation pathways, they can be combined if the latter are generated as transients from diazo compounds under blue light irradiation to undergo rapid Wolff rearrangement to generate reactive ketenes. Subsequent addition of sulfoximines or sulfonimidamides lead to N-acylated products in good to excellent yields. Beneficial are the mild reaction