A convenient and efficient visible-light-induced tandem acylation/cyclization of N-propargylindoles with aryl- or alkyl-substituted acyl oxime esters for the synthesis of 2-acyl-substituted 9H-pyrrolo[1,2-a]indoles under transition-metal-free conditions, which proceeds via nitrogen-centered radical-mediated cleavage of the C–C σ-bond in acyl oxime esters, is established. The aryl or alkylacyl radicals
N-炔丙基吲哚与芳基-或烷基-取代的酰基肟酯的方便有效的可见光诱导串联酰化/环化,用于合成2-酰基-取代的9 H-吡咯并[1,2- a ]吲哚过渡建立了无金属条件,该条件通过氮中心自由基介导的酰基肟酯中 C-C σ 键的裂解进行。来自酰基肟酯的芳基或烷基酰基自由基攻击N-炔丙基吲哚中的 C-C 三键,然后进行分子内环化/异构化。
Visible Light-Catalyzed Cascade Radical Cyclization of <i>N</i>-Propargylindoles with Acyl Chlorides for the Synthesis of 2-Acyl-9<i>H</i>-pyrrolo[1,2-<i>a</i>]indoles
tandem radical cyclization of N-propargylindoles with acyl chlorides for accessing 2-acyl-9H-pyrrolo[1,2-a]indoles is established. This transformation involves sequential addition of the acyl radical to the carbon-carbon triple bond, intramolecular cyclization with the 2-position of indole, and isomerization of the carbon-carbon double bond. The experimental results show that this reaction contains
Facile synthesis of substituted thiophenes via Pd/C-mediated sonogashira coupling in water
作者:Sirisilla Raju、P. Rajender Kumar、K. Mukkanti、Pazhanimuthu Annamalai、Manojit Pal
DOI:10.1016/j.bmcl.2006.09.041
日期:2006.12
The first successful Pd/C-mediated Sonogashira coupling of iodothiophene with terminal alkynes in water is described here. Pd/C-CuI-PPh(3) was found to be an efficient catalyst system for this coupling reaction. Using this economic and reliable process a variety of acetylenic thiophenes with a wide range of functional groups were prepared in good yields. Synthetic applications and in vitro anticancer
One‐Pot Two‐Step Double Annulation of
<i>N</i>
‐Methoxybenzamides with Alkynes and Alkenes: Regioselective Construction of Isoindolo[2,1‐
<i>b</i>
]isoquinolin‐5(7
<i>H</i>
)‐ones
one-pot two-step doubleannulation strategy to produce isoindolo[2,1-b]isoquinolin-5(7H)-ones via the reaction of N-methoxybenzamides with symmetrical/unsymmetrical alkynes and alkenes has been developed, which proceeds through Ru-catalysed unsymmetrical doubleannulations using a single DG under single catalytic conditions. Furthermore, we have developed amide-alkyne regioselective annulations using unsymmetrical
的单釜两步双环策略以产生异吲哚基[2,1- b ]异喹啉-5(7 ħ) -酮通过的反应Ñ -methoxybenzamides具有对称/不对称炔烃及烯烃已经被开发,其通过进行在单一催化条件下使用单一 DG 进行 Ru 催化的不对称双环化。此外,我们使用不对称的内部炔烃开发了酰胺-炔烃区域选择性环化,该炔烃具有导致单一异构体的氧/氮取代基。所开发的程序提供了广泛的底物范围,容忍了广泛的官能团,并提供了良好的产品收率。
Visible-light-induced cascade sulfonylation/cyclization of <i>N</i>-propargylindoles with aryldiazonium tetrafluoroborates <i>via</i> the insertion of sulfur dioxide
K2S2O5 and aryldiazoniumtetrafluoroborates for the construction of 2-sulfonyl-substituted 9H-pyrrolo[1,2-a]indoles is developed. In this transformation, K2S2O5 as a simple and inexpensive sulfur dioxide source provides sulfur dioxide for accessing sulfonyl radicals. This method features excellent functional group tolerance and offers a convenient route for assembling a new C–C bond and two new C–S bonds
开发了一种简单有效的可见光催化的N-炔丙基吲哚与K 2 S 2 O 5和芳基重氮四氟硼酸酯的级联磺化/环化反应,用于构建2-磺酰基取代的9 H-吡咯并[1,2- a ]吲哚。在这种转化中,K 2 S 2 O 5作为一种简单而廉价的二氧化硫源,提供了用于接触磺酰基的二氧化硫。该方法具有出色的官能团耐受性,并且为一步组装一个新的C–C键和两个新的C–S键提供了便捷的途径。