Synthesis of unsymmetrically substituted meso-phenylporphyrins by Suzuki cross coupling reactions
作者:Baolu Shi、Ross W. Boyle
DOI:10.1039/b201622b
日期:2002.5.23
Unsymmetrically substituted tetraphenylporphyrins, including A2B2 and AA′B2 types can be synthesised by bromination of 5,15-diphenylporphyrins followed by palladium catalysed Suzuki coupling to arylboronic acids and esters. Unsymmetrically substituted triphenylporphyrins are also accessed via partial debromination in situ.
Electrophilic Sulfur Reagent Design Enables Directed <i>syn</i>-Carbosulfenylation of Unactivated Alkenes
作者:Zi-Qi Li、Yilin Cao、Taeho Kang、Keary M. Engle
DOI:10.1021/jacs.1c13252
日期:2022.4.27
A multi-component approach to structurally complex organosulfur products is described via the nickel-catalyzed 1,2-carbosulfenylation of unactivated alkenes with organoboron nucleophiles and tailored organosulfur electrophiles. The key to the development of this transformation is the identification of a modular N-alkyl-N-(arylsulfenyl)arenesulfonamide family of sulfur electrophiles. Tuning the electronic
Molecular Design of Highly Selective and Sensitive “Sugar Tweezers” from Boronic Acid-Appended<i>μ</i>-Oxo-bis[porphinatoiron(III)]s
作者:Masayuki Takeuchi、Tomoyuki Imada、Seiji Shinkai
DOI:10.1246/bcsj.71.1117
日期:1998.5
4-(dihydroxyboryl)phenyl]porphinatoiron(III)s (1a and 1b, respectively) were synthesized and the saccharide-binding ability of their μ-oxo dimers was investigated. The saccharide-binding process with boronic acids can be conveniently monitored by CD spectroscopy. The μ-oxo dimer of 1b with 4-(hydroxyboryl) groups can bind glucose and galactose among monosaccharides with extremely high selectivity and sensitivity
without an external base for the synthesis, with excellent functional-group tolerance of asymmetric biaryls. Both coupling partners are readily available, bench-stable, and non-toxic. A broad array of (pseudo)halogenated and borylated coupling partners can be successfully applied to this site-specific biaryl coupling with unprecedented versatility. Its synthetic value has been substantiated by concise preparation