Iron-catalyzed cross-dehydrogenative C N coupling of thiohydantoins with various amines
作者:Sulochana S. Mudaliar、Anuj P. Patel、Janki J. Patel、Kishor H. Chikhalia
DOI:10.1016/j.tetlet.2018.01.024
日期:2018.2
hetero-cross-dehydrogenative coupling (CDC) of diverse thiohydantoins with amines utilizing TBHP as the oxidant was developed. This sp3 CH amination at the carbons alpha to carbonyl groups of thiohydantoin tolerates the presence of a wide range of functional groups and provides the corresponding N-substituted amines in moderate to good yields. Various substrate scopes and optimum reaction conditions leads inside
提出了一种新的铁催化的C N键构建方法,该方法利用TBHP作为氧化剂,将多种硫代乙内酰脲与胺进行异质-交叉-脱氢偶联(CDC)。这种在硫代乙内酰脲的α至羰基碳原子上的sp 3 C H胺化耐受多种官能团的存在,并以中等至良好的产率提供相应的N-取代的胺。各种底物范围和最佳反应条件是有机合成的内在原因。
Iron-Catalyzed Oxidative C(sp3)–C(sp3) Radical Coupling Reaction between Thiohydantoins and O-Acetyloximes for the Synthesis of 1,3-Dibenzyl-3,4-dihydropyrrolo[2,3-d]imidazole-2(1H)-thione Derivatives
作者:Kishor H. Chikhalia、Parth P. Patel
DOI:10.1055/a-2302-0450
日期:——
A unified heteroannelation method to achieve the synthesis of 1,3-dibenzyl-3,4-dihydropyrrolo[2,3-d]imidazole-2(1H)-thione derivatives with an iron catalyst is proposed. The annelation reaction follows a C(sp3)–C(sp3) radical coupling between a thiohydantoin and an O-acetyloxime. The synthetic approach enables access to several alkynylated thiohydantoins and O-acetyloximes with controlled selectivity
提出了一种用铁催化剂合成1,3-二苄基-3,4-二氢吡咯并[2,3- d ]咪唑-2(1H ) -硫酮衍生物的统一杂环合方法。稠合反应遵循乙内酰硫脲和O-乙酰肟之间的C(sp 3 )–C(sp 3 ) 自由基偶联。该合成方法能够以中等到高产率获得多种炔基化乙内酰硫脲和O-乙酰肟,并且对C(sp 3 )–C(sp 3 )偶联而不是C(sp 3 )–C(sp 3 )–O偶联具有受控选择性。通过改变催化剂负载量、氧化剂、溶剂和温度进行了优化研究。通过1 H 和13 C NMR 以及质谱研究对合成的化合物进行了表征。
Iron‐catalyzed construction of cyanomethylated thiohydantoins by cross‐dehydrogenative C(sp
<sup>3</sup>
)‐C(sp
<sup>3</sup>
) coupling
作者:Mayur I. Morja、Riddhi B. Moradiya、Bhavik S. Makwana、Kishor H. Chikhalia
DOI:10.1002/jhet.4599
日期:2023.3
AbstractThe efficient and novel approach for synthesizing cyanomethylated thiohydantoin from readily obtainable acetonitrile and 1,3‐dibenzyl‐2‐thiohydantoin through iron(II)‐catalyzed cross dehydrogenative coupling (CDC) protocol is documented here. The strategy displays extensive substrate scope, and provides an effectual construction of cyanomethylated thiohydantoins in moderate to good yield. Prominently, this new methodology represents hitherto unobserved reactivity pattern for the thiohydantoin.
“Iron catalyzed alkynylation of thiohydantoins with terminal alkyne via cross-dehydrogenative coupling (CDC)”
作者:Mayur I. Morja、Prakashsingh M. Chauhan、Kishor H. Chikhalia
DOI:10.1016/j.tetlet.2021.153148
日期:2021.8
Iron(II)-catalyzed alkynylation of thiohydantoins with terminalalkyne has been firstly reported. Optimization study was carried out through various catalysts, oxidants and solvents. The merit of this strategy is illustrated by the breadth of functional groups tolerated in the transformation. This study offers a unified method to access several alkynylated thiohydantoins in moderate to higher yield via C(sp3)-C(sp)
Solution-Phase Synthesis of a Combinatorial Thiohydantoin Library<sup>1</sup>
作者:Mui Mui Sim、Arasu Ganesan
DOI:10.1021/jo962376u
日期:1997.5.1
triethylamine, leading to the thiohydantoin product in high yield and purity after an extractive aqueous workup. This procedure was used to generate a combinatoriallibrary of over 600 discrete thiohydantoins on a 0.1 mmol scale. Sampling of 10% of this library showed the thiohydantoin to be the major product in all cases, with purities of 52-98% by HPLC analysis. The cyclization conditions can also