Preparation of 4-Halobenzoate-Containing Phosphane-Based Building Blocks for Labeling Reactions Using the Traceless Staudinger Ligation
摘要:
Functionalized phosphane-containing key building blocks were synthesized that are suitable for the labeling of biologically active molecules by the traceless Staudinger ligation. Thus, a 2-(diphenylphosphanyl) phenyl 4-stannylbenzoate building block was converted into the 4-iodobenzoate by the introduction of iodine. The traceless Staudinger ligation was used to introduce the resulting 4-iodobenzoate moiety into selected molecules of pharmacological interest. Furthermore, the labeling procedure was used to insert the 4-iodobenzoate moiety into a peptide on solid support. Finally, a convenient recovery procedure of the key phosphane building block 2-(diphenylphosphanyl) phenol from 2(diphenylphosphoryl) phenol was evaluated.
Near-infrared tunable bacteriochlorins equipped for bioorthogonal labeling
作者:Jianbing Jiang、Masahiko Taniguchi、Jonathan S. Lindsey
DOI:10.1039/c5nj00209e
日期:——
sciences. To broaden the scope for (bio)molecular labeling, nine lipophilic, wavelength-tunable (729–820 nm) bacteriochlorins (seven free base; two zinc chelates) have been prepared that bear a single bioconjugatable group. The latter include an aldehyde for oxime formation, a maleimido group for thioether formation, an ester or thioester group for traceless Staudinger ligation, or an azido group for click
Synthesis of<i>C</i><sub>2</sub>-Symmetric Bisphosphine Ligands from Tartaric Acid, and Their Performance in the Pd-Catalyzed Asymmetric<i>O</i>-Allylation of a Phenol
Starting fromtartaricacid derived chiral diols or dicarboxylic acid dichlorides with either a 2,2-dimethyl-1,3-dioxolane (Taddol) or a 2,3-dimethoxy-2,3-dimethyl-1,4-dioxane (Tatrol) core structure, and BH3-protected ortho-phosphanyl phenols, a set of fourteen new C2-symmetric diphosphine ligands was synthesized. In addition, three related ligands were obtained from ortho-diphenylphosphino-anilines
Rhodium-Catalyzed P<sup>III</sup>
-Directed <i>ortho</i>
-C−H Borylation of Arylphosphines
作者:Jian Wen、Dingyi Wang、Jiasheng Qian、Di Wang、Chendan Zhu、Yue Zhao、Zhuangzhi Shi
DOI:10.1002/anie.201813452
日期:2019.2.11
Transition‐metal‐mediated metalation of an aromatic C−H bond that is adjacent to a tertiary phosphine group in arylphosphines via a four‐membered chelate ring was first discovered in 1968. Herein, we overcome a long‐standing problem with the ortho‐C−H activation of arylphosphines in a catalytic fashion. In particular, we developed a rhodium‐catalyzed ortho‐selective C−Hborylation of various commercially
Ruthenium‐Catalyzed
<i>ortho</i>
C−H Borylation of Arylphosphines
作者:Kazuishi Fukuda、Nobuharu Iwasawa、Jun Takaya
DOI:10.1002/anie.201813278
日期:2019.2.25
Efficient, phosphine‐directed ortho C−H borylation of arylphosphine derivatives was achieved using Ru catalysts for the first time. The reaction is applicable to various tertiary arylphosphine and arylphosphinite derivatives to give (o‐borylaryl)phosphorus compounds in high yields. This reaction enables easy access to a variety of functionalizedphosphine ligands and ambiphilic phosphine boronate compounds
Asymmetric Hydroformylation Using Taddol-Based Chiral Phosphine−Phosphite Ligands
作者:Tobias Robert、Zohar Abiri、Jeroen Wassenaar、Albertus J. Sandee、Steffen Romanski、Jörg-Martin Neudörfl、Hans-Günther Schmalz、Joost N. H. Reek
DOI:10.1021/om9009735
日期:2010.1.25
High-pressure NMR of the active catalyst [HRh(P−P)(CO)2] (P−P = 10h) revealed an equatorial-apical coordination of the ligand at rhodium. Temperature dependency of the coupling constants observed during the experiment indicates equilibrium between the two equatorial-apical isomers, with the isomer in which the phosphite occupies the equatorial position being the dominant species.