C–H Alkenylation of Heteroarenes: Mechanism, Rate, and Selectivity Changes Enabled by Thioether Ligands
作者:Bradley J. Gorsline、Long Wang、Peng Ren、Brad P. Carrow
DOI:10.1021/jacs.7b03887
日期:2017.7.19
catalytic intermediate in these reactions may also account for unusual catalyst-controlled site selectivity wherein C–H alkenylation of five-atom heteroarenes can occur under electronic control with thioether ligands even when this necessarily involves reaction at a more hindered C–H bond. The thioether effect also enables short reaction times under mild conditions for many O-, S-, and N-heteroarenes (55 examples)
Regioselective preferential C H activation of sterically hindered 1,3-dienes over [4+2] cycloaddition
作者:Rakesh K. Saunthwal、Kapil Mohan Saini、Monika Patel、Akhilesh K. Verma
DOI:10.1016/j.tet.2017.03.028
日期:2017.4
Pd-catalyzed preferential CH activation of sterically hindered α, β-olefinic indoles onto alkenes beyond [4 + 2] cycloaddition has been described. The carbazole derivatives were readily synthesized via activation of vinylic CH bonds with excellent regioselectivity. Further, the one-pot strategy has been employed for the synthesis of tricyclic carbazoles. The double and triple CH activation followed by concomitant
Solution‐Phase Late‐Stage Chemoselective Photocatalytic Removal of Sulfonyl and Phenacyl Groups in Peptides
作者:Samrat Kundu、Modhu Sudan Maji
DOI:10.1002/chem.202400033
日期:2024.4.16
overcoming the isolation issue up to octamers. Additionally, organophotocatalyst BPC demonstrates efficient solution-phase phenacyl deprotection from C-terminal in peptides. This effective and mild strategy portrayes exceptional selectivity by tolerating a wide range of functional groups in heteroaromatics and peptides.
本文提出了可见光介导的 BPC 催化的寡肽中色氨酸、酪氨酸和组氨酸氨基酸残基的后期溶液相脱磺酰化,克服了八聚体的分离问题。此外,有机光催化剂 BPC 表现出有效的溶液相苯甲酰基肽 C 端脱保护作用。这种有效且温和的策略通过耐受杂芳族化合物和肽中的各种官能团而展现出卓越的选择性。