A general and efficient procedure for p-toluenesulfonic acid-catalyzed iodination of isoquinolin-1(2H)-ones with N-iodosuccinimide at room temperature is described. This method provides an alternative way of constructing C–I bonds, affords various 4-iodoisoquinolin-1(2H)-ones in moderate to good yields, and shows a broad substrate scope and good functional group tolerance.
描述了在室温下对甲苯磺酸催化异喹啉-1(2 H)-酮与 N-碘代琥珀酰亚胺碘化的一般有效程序。该方法提供了另一种构建 C-I 键的方法,以中等至良好的产率提供各种 4-iodoisoquinolin-1(2 H )-one,并显示出广泛的底物范围和良好的官能团耐受性。
Rhodium‐Catalyzed C8‐Alkenylation of Isoquinolones with Maleimides
作者:Manisha、Devesh Chandra、Upendra Sharma
DOI:10.1002/ejoc.202300411
日期:2023.8.7
Selectiveolefination of N-protected isoquinolones at C8-position has been achieved under rhodiumcatalysis. A range of maleimides were employed to obtain the olefinated products in moderate to excellent yield with excellent selectivity. Kinetic Isotope Effect (KIE) study and Hammett plot analysis were also performed to understand the reaction mechanism.
Co(III)-catalysed site-selective C8-allylation and vinylation of isoquinolones with allyl acetate and vinyl acetates has been accomplished. The oxo group of isoquinolone has been utilised as an inherent directing group. Based on preliminary mechanistic studies, a plausible mechanism for the developed reaction has also been delineated. Broad substrate scope with good to excellent yields and post-synthetic
Co( III )催化的异喹诺酮类与乙酸烯丙酯和乙酸乙烯酯的位点选择性C8烯丙基化和乙烯基化已经完成。异喹诺酮的氧代基团已被用作固有的导向基团。基于初步的机理研究,还描述了所开发的反应的合理机理。广泛的底物范围、良好至优异的产率以及烯丙基化和乙烯基化异喹啉的合成后转化凸显了该反应的重要性。
A strategy for Co(III)-catalyzed C(sp2)–H alkenylation of N-protected isoquinolones with 1,4-naphthoquinones has been disclosed. The developed protocol was efficiently applied for diversely substituted isoquinolones. Preliminary mechanistic experiments revealed the involvement of a five-membered cobaltacycle as an intermediate. Deuterium labeling experiments suggested the reversible nature of the C–H
New Reduction Reaction of Benzylic Alcohols with Acid and Proof of the Intermolecular Hydride Shift Mechanism
作者:Masaru Kihara、Jun-ichi Andoh、Chiaki Yoshida
DOI:10.3987/com-99-8786
日期:——
The new reduction reaction of the hydroxy groups of 4-hydroxy-4-phenyl-1,2,3,4-tetrahydroisoquinolines (1) to the corresponding alkanes (2) with mineral and Lewis acids is reported. A stereoselective intermolecular hydride shift mechanism of the reduction was proved by reaction of the deuterated derivateives (14 and 15) of 1a with 10N HCl-C2H5OH and BBr3 in CH3CN.