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.
Diastereoselectively Complementary C–H Functionalization Enables Access to Structurally and Stereochemically Diverse 2,6-Substituted Piperidines
作者:Gang Wang、Ying Mao、Lei Liu
DOI:10.1021/acs.orglett.6b03372
日期:2016.12.16
The preparation of 2,6-substituted piperidine derivatives through diastereoselective C–H functionalization of corresponding nitrogen heterocycles represents an appealing protocol and yet remains a formidable challenge. Here, we describe a stereochemically complementary oxidative C–H functionalization of N-carbamoyl tetrahydropyridines with a wide variety of building blocks, providing either the cis-
Oxymetallation. Part 24. Preparation of cyclic peroxides by cycloperoxymercuriation of unsaturated hydroperoxides.
作者:A.J. Bloodworth、Richard J. Curtis、Michael D. Spencer、Neil A. Tallant
DOI:10.1016/s0040-4020(01)86350-x
日期:1993.3
Seventeen unsaturated hydroperoxides have been converted by treatment with mercury(II) acetate and/or mercury(II) nitrate into nineteen new mercuriated cyclic peroxides and by subsequent demercuriation with alkaline sodium borohydride, six new mercury-free peroxides have been isolated. The results greatly extend the range of such reactions and provide information about the stereoselectivities and relative
Homoallyl−Cyclopropylcarbinyl Cation Manifold. Trimethylsilyl versus Aryl Stabilization
作者:Xavier Creary、Benjamin D. O'Donnel、Marie Vervaeke
DOI:10.1021/jo062668n
日期:2007.4.1
E-trifluoroacetate (p-CH3) along with the E-substitution product. This isomerization suggests that the cyclized β-silyl cation can isomerize and then reopen to a classical aryl-stabilized cation. By way of contrast, B3LYP/6-31G* computational studies show only cyclized β-silyl cations as energy minima. Open kC cations are higher-energy nonminimum energy structures.