首次提出了一种以简单的α-磺酰基碳阴离子作为亲核试剂的高效钯催化 AAA 反应。烯丙基氟化物用作生成 π-烯丙基复合物的优良前体,该复合物在电离时释放氟阴离子以激活硅烷化亲核试剂。以独特的双齿二酰胺基亚磷酸酯配体连接钯为催化剂,原位生成的α-磺酰基碳阴离子被烯丙基中间体快速捕获,提供了一系列高效、高选择性的手性同型烯丙基砜。这项工作提供了一种温和的原位脱甲硅烷化策略,以揭示可用于克服 p K a 的亲核碳中心 “硬”亲核试剂在对映选择性转化中的限制。
Synthesis of aryl allylic fluorides by direct electrophilic fluorination of alkenes
作者:Hai-Qing Luo、Teck-Peng Loh
DOI:10.1016/j.tetlet.2009.01.052
日期:2009.4
Aryl allylic fluorides were synthesized in 47-83% yields by using Selectfluor as the electrophilic reagent in DMF. The outcome of this reaction may be explained by electronic effects while the reactivity was controlled by the stabilization effect of the aryl group on the benzylic cationic intermediates. (C) 2009 Elsevier Ltd. All rights reserved.
The first palladium-catalyzedasymmetric allylic trifluoromethylation is disclosed. The methodology evokes a fundamental principle by which the synergistic interplay of a leaving group and its subsequent activation of the nucleophilic trifluoromethyl group enabled the reaction. Allyl fluorides have been shown to be superior precursors for generation of π-allyl complexes, which lead to trifluoromethylated
Palladium-catalyzed asymmetric allylic alkylation (AAA) with alkyl sulfones as nucleophiles
作者:Barry M. Trost、Zhiwei Jiao、Hadi Gholami
DOI:10.1039/d1sc02599f
日期:——
An efficient palladium-catalyzed AAA reaction with a simple α-sulfonyl carbon anion as nucleophiles is presented for the first time. Allyl fluorides are used as superior precursors for the generation of π-allyl complexes that upon ionization liberate fluoride anions for activation of silylatednucleophiles. With the unique bidentate diamidophosphite ligand ligated palladium as catalyst, the in situ
首次提出了一种以简单的α-磺酰基碳阴离子作为亲核试剂的高效钯催化 AAA 反应。烯丙基氟化物用作生成 π-烯丙基复合物的优良前体,该复合物在电离时释放氟阴离子以激活硅烷化亲核试剂。以独特的双齿二酰胺基亚磷酸酯配体连接钯为催化剂,原位生成的α-磺酰基碳阴离子被烯丙基中间体快速捕获,提供了一系列高效、高选择性的手性同型烯丙基砜。这项工作提供了一种温和的原位脱甲硅烷化策略,以揭示可用于克服 p K a 的亲核碳中心 “硬”亲核试剂在对映选择性转化中的限制。