A new catalytic difluorohydration of β-alkynyl ketones using NFSI as the fluorinating reagent has been established, diastereoselectively furnishing a range of structurally diverse difluoride 1,5-dicarbonyl products through C(sp3)-H fluorination. Notably, the sterically encumbered t-butyl functionality located at α-position of carbonyl group of substrates 1 behaved the excellent diastereoselectivity
Just a DAB: A new metal-free [2+2] cycloaddition/S-centered radical induced 1,4-addition sequence of benzene-linked allene-ynes has been established by treatment with aryldiazonium tetrafluoroborates and DABCO-bis(sulfur dioxide) under convenient reaction conditions, thus providing practical access to functionalized cyclobuta[a]naphthalen-4-ols of chemical and biomedical importance. DABCO=1,4-diazabicyclo[2
A new visible‐light photocatalytic arylsulfonylation and bicyclization of C(sp3)‐tethered 1,7‐enynes with sulfinic acids has been developed, delivering functionalized sulfone‐containing benzo[a]fluoren‐5‐ones with generally good yields. This Eosin Y‐catalyzed approach makes use of visible light as a safe and eco‐friendly energy source to drive cascade cyclization reactions, resulting in continuous
已开发出一种新的可见光光催化芳基磺酰化和C(sp 3)系的1,7-烯炔与亚磺酸的双环化,可提供官能化的含砜苯并[ a ]芴-5酮,且收率普遍良好。这种曙红Y催化方法利用可见光作为一种安全且生态友好的能源来驱动级联环化反应,从而导致连续的多个成键事件(包括C–S和C–C键)有效地构建多环连接的烷基芳基砜。
Radical Cascade Bicyclization/Aromatization of 1,7‐Enynes with 1,3‐Dicarbonyl Compounds towards 2,3‐Dihydro‐1
<i>H</i>
‐cyclopenta[
<i>a</i>
]naphthalenes
An Ag-catalyzed radical cascade bicyclization/aromatization of C-linked 1,7-enynes with 1,3-dicarbonyls has been achieved, providing a step- and atom-economy approach for the construction of 2,3-dihydro-1H-cyclopenta[a]naphthalenes, an important structural scaffold existed in biologically active compounds. From this transformation, structurally diverse 2,3-dihydro-1H-cyclopenta[a]naphthalenes were
已经实现了银催化自由基级联双环化/芳构化的C-连接的 1,7-烯炔与 1,3-二羰基,为构建 2,3-二氢-1 H-提供了一步和原子经济的方法-环戊二烯[ a ]萘,一种重要的结构支架,存在于生物活性化合物中。通过这种转化,以中等至良好的产率和高区域选择性获得了结构多样的 2,3-二氢-1 H-环戊二烯 [ a ] 萘。此外,还举例说明了进一步的产品衍生化。