I
<sub>2</sub>
‐Promoted [3+2] Cyclization of 1,3‐Diketones with Potassium Thiocyanate: a Route to Thiazol‐2(3
<i>H</i>
)‐One Derivatives
作者:Zhenyu An、Yafeng Liu、Pengbo Zhao、Rulong Yan
DOI:10.1002/adsc.202100228
日期:2021.7
An I2-promoted strategy has been developed for the synthesis of thiazol-2(3H)-onederivatives from 1,3-diketones with potassium thiocyanate. This [3+2] cyclization reaction involves C−S and C−N bond formation and exhibits good functional group tolerance. A series of thiazol-2(3H)-onederivatives are obtained in moderate to good yields.
已开发出一种 I 2促进策略,用于从 1,3-二酮与硫氰酸钾合成 thiazol-2(3 H )-one 衍生物。这种 [3+2] 环化反应涉及 C-S 和 CN 键的形成,并表现出良好的官能团耐受性。以中等至良好的产率获得了一系列 thiazol-2(3 H )-one 衍生物。
Proline-catalyzed aldol reactions of acyl cyanides with acetone: an efficient and convenient synthesis of 1,3-diketones
作者:Zongxuan Shen、Bin Li、Lu Wang、Yawen Zhang
DOI:10.1016/j.tetlet.2005.10.036
日期:2005.12
The aldol-type addition of acetonetowards (un)substituted benzoyl, heteroarylcarbonyl or α,β-unsaturated acyl cyanides was efficiently catalyzed by l-proline (30 mol %) to give 2-hydroxy-4-oxo-2-substituted pentanenitriles. Upon the treatment with sodium hydroxide, the adducts transformed to 1,3-diketones in good-to-excellent yield, furnishing an efficient and convenient method for the regioselective
aldehydes and ketones has been developed using Bu4NI (TBAI) as the catalyst. In the presence of DTBP–TBHP/p-TsOH, aldehydes undergo radical coupling with ketones to provide the desired products in moderate to high yields at 120 °C. Although various substituents on the aromatic ring of aldehydes are well tolerable under the standard reaction conditions, the protocol is limited by the scope of ketones. The method
使用Bu 4 NI(TBAI)作为催化剂,已经开发了一种从醛和酮合成1,3-二酮的有效方法。在DTBP–TBHP / p -TsOH的存在下,醛与酮进行自由基偶联,从而在120°C下以中等至高收率提供所需的产物。尽管在标准反应条件下醛的芳环上的各种取代基均具有良好的耐受性,但该方案受到酮的范围的限制。该方法在起始原料容易获得,操作简单,官能团耐受性和不存在金属催化剂方面显示出优点。
Tandem coupling reactions of benzynes and 1,3-diones: a novel synthesis of 2,2-diphenyl-1,3-diones
作者:Yun-Yun Yang、Wang-Ge Shou、Yan-Guang Wang
DOI:10.1016/j.tetlet.2007.09.092
日期:2007.11
A novel, general, and mild method is described to prepare 2,2-diphenyl-1,3-diones with benzyne using CuBr and trichloroacetic acid as the catalyst.
α-position of acetophenone derivatives to donor–acceptorcyclopropanes, were synthesized in two steps via first ringopening of donor–acceptorcyclopropanes with acyclic 1,3-diketones followed by DBU catalyzed retro-Claisen-type C–C bond cleavage reactions. In the first step, acyclic 1,3-diketones selectively worked as C-nucleophiles to add to donor–acceptorcyclopropanes. In the second step, the alkyl ketone