A11C-Methyl stannane(5-[11C]methyl-1-aza-5-stanna-bicyclo[3.3.3]undecane) for use in palladium-mediated[11C]C–C bond forming reactions with organohalides
Preparation of Enantioenriched Alkylcarbastannatranes via Nucleophilic Inversion of Alkyl Mesylates for Use in Stereospecific Cross-Coupling Reactions
作者:Glenn Ralph、Mark R. Biscoe
DOI:10.1021/acs.organomet.9b00467
日期:2019.10.28
We report the preparation of enantioenriched secondary alkylcarbastannatranes via a stereoinvertive SN2 reaction of enantioenriched alkyl mesylates and carbastannatranyl anion equivalents. Using this process, enantioenriched secondary alcohols may be converted into highly enantioenriched alkylcarbastannatranes, which are useful in stereospecific cross-coupling reactions.
我们报告了通过对映体富集的烷基甲磺酸盐和碳原子化炔基阴离子等价物的立体转化S N 2反应制备对映体富集的仲烷基氨基甲酸酯。使用该方法,可以将对映体富集的仲醇转化为高度对映体富集的烷基碳黄烷烃,其可用于立体有择的交叉偶联反应中。
Stereospecific Electrophilic Fluorination of Alkylcarbastannatrane Reagents
作者:Xinghua Ma、Mohamed Diane、Glenn Ralph、Christine Chen、Mark R. Biscoe
DOI:10.1002/anie.201704672
日期:2017.10.2
Speed matters: Site-specific fluorination reactions of isolable primary and secondary alkylcarbastannatrane nucleophiles occur fast, without the need for transition metal catalysis, or in situ activation of the nucleophile. The reaction conditions can also be extended to stereospecific chlorination, bromination, and iodination reactions.
The hypercoordinated tin reagent iPr-tricarbastannatrane is employed in B(C6F5)3-catalyzed transfer 1,4-hydrostannanylation of electron deficient olefins.
Stereospecific Palladium‐Catalyzed Acylation of Enantioenriched Alkylcarbastannatranes: A General Alternative to Asymmetric Enolate Reactions
作者:Chao‐Yuan Wang、Glenn Ralph、Joseph Derosa、Mark R. Biscoe
DOI:10.1002/anie.201609930
日期:2017.1.16
We report the development of a Pd‐catalyzed process for the crosscoupling of unactivated primary, secondary, and tertiary alkylcarbastannatrane nucleophiles with acyl electrophiles. Reactions involving optically active alkylcarbastannatranes occur with exceptional stereofidelity and with net retention of absolute configuration. Because the stereochemistry of the resulting products is entirely reagent‐controlled
An aziridinyl stannatrane 8 couples with aryl or alkenyl halides RX under modified Stille conditions to afford substituted aziridines. Efficient coupling at room temperature is possible in the best examples in the presence of (tBu3P)2Pd and CuOP(O)Ph2 (CuDPP).
在改良的Stille条件下,将叠氮基烷基锡烷8与芳基或烯基卤化物RX偶合,得到取代的氮丙啶。在(t Bu 3 P)2 Pd和CuOP(O)Ph 2(CuDPP)存在的最佳示例中,室温下的有效耦合是可能的。