Cyanoborohydrides are efficient reagents in the reductive addition reactions of alkyl iodides and electron-deficient olefins. In contrast to using tinreagents, the reaction took place chemoselectively at the carbon–iodine bond but not at the carbon–bromine or carbon–chlorine bond. The reaction system was successfully applied to three-component reactions, including radical carbonylation. The rate constant
氰基硼氢化物是烷基碘化物和缺电子烯烃的还原加成反应中的有效试剂。与使用锡试剂相反,该反应在碳碘键上发生化学选择,而在碳溴或碳氯键上没有发生。该反应体系已成功应用于三组分反应,包括自由基羰基化。通过动力学竞争法,在25°C下从氰基硼氢化四丁基铵中伯烷基脱氢的速率常数估计为<1×10 4 M –1 s –1。该值比氢化三丁基锡的值小3个数量级。
Carboxyl-Directed Conjugate Addition of C−H Bonds to <i>α</i>
,<i>β</i>
-Unsaturated Ketones in Air and Water
作者:Wen-Jing Han、Fan Pu、Chao-Jun Li、Zhong-Wen Liu、Juan Fan、Xian-Ying Shi
DOI:10.1002/adsc.201701468
日期:2018.4.3
removable carboxyl group was developed as an effective protocol to synthesize ortho‐alkylated benzoic acids in a greener manner. Without any additives, satisfactory to excellent yields of the targeted products were achieved in neat water, and the process characterizes in mild reaction conditions (in air and water), simple operations, and broadsubstratescope. Noteworthy features of this method include
This application relates to derivatives of hydrocarbon terpenes (e.g., myrcene or farnesene), to methods of making the derivatives, and to the use of the derivatives as surfactants.
Tin-free Giese reaction and the related radical carbonylation process proceeded efficiently in the presence of sodium cyanoborohydride and tetrabutylammonium cyanoborohydride. The reaction took place chemoselectively at the carbon-iodine bond but not at the carbon-bromine and carbon-chlorine bonds. The iodine atom transfer followed by hydride reduction of the resulting carbon-iodine bond is proposed
Divergent Syntheses of Spiroindanones and 2-Substituted 1-Indanones by Ruthenium-Catalyzed Tandem Coupling and Cyclization of Aromatic Acids with α,β-Unsaturated Ketones
作者:Jia-Ni Wang、Si-Qi Chen、Zhong-Wen Liu、Xian-Ying Shi
DOI:10.1021/acs.joc.8b02820
日期:2019.2.1
The one-step strategy for the facile syntheses of structurally diverse 1-indanones in moderate to good isolated yields was developed via a ruthenium-catalyzed tandem coupling and cyclization of simple aromatic acids with α,β-unsaturatedketones. The tandem cyclization involves one-pot sequential reactions of C–H activation, conjugate addition, Dieckmann condensation, Michael addition, intramolecular