Enantioselective Copper-Catalyzed Methylboration of Alkenes
作者:Bin Chen、Peng Cao、Yang Liao、Min Wang、Jian Liao
DOI:10.1021/acs.orglett.7b03860
日期:2018.3.2
on (B2(pin)2), and methyl iodide is reported. Alkenes including styrenes, β-substituted styrenes, and challenging aliphatic olefins were smoothly transferred to the desired methylboration products with excellent diastereoselectivities (dr up to >99:1) and enantioselectivities (er up to 99:1). The utility of this process was demonstrated by the synthesis of naproxen and formal synthesis of two natural
Harnessing Alkylpyridinium Salts as Electrophiles in Deaminative Alkyl–Alkyl Cross-Couplings
作者:Shane Plunkett、Corey H. Basch、Samantha O. Santana、Mary P. Watson
DOI:10.1021/jacs.9b00111
日期:2019.2.13
A Negishicross-coupling of alkylpyridinium salts and alkylzinc halides has been developed. This is the first example of alkyl-alkyl bond formation via cross-coupling of an alkyl amine derivative with an unactivated alkyl group, and allows both primary and secondary alkylpyridinium salts to react with primary alkylzinc halides with high functional group tolerance. When combined with formation of the
bisphosphine monochelation to transition metals under conditions where homogeneousligands may form bischelated single metal complexes or multinuclear complexes. PS-DPPBz showed high ligand performance in first-row transition metal catalysis, enabling challenging molecular transformations that were not possible through the screening of existing homogeneousligands. In the Ni-catalyzed amination of aryl
Site‐Fixed Hydroboration of Terminal and Internal Alkenes using BX
<sub>3</sub>
/
<sup>
<i>i</i>
</sup>
Pr
<sub>2</sub>
NEt**
作者:Sida Li、Chenyang Hu、Xin Cui、Jiong Zhang、Liu Leo Liu、Lipeng Wu
DOI:10.1002/anie.202111978
日期:2021.12.6
A novel and general method for the hydroboration of alkenes, including arylalkenes, 1,1-disubstitutedalkenes, aliphatic alkenes, and bio-derived alkenes, using BX3 as the boration reagent in the presence of iPr2NEt is reported. The reaction was also applied to the synthesis of linear and branched 1,n-diborylalkanes. The reaction is thought to proceed by a frustrated Lewis pair type single-electron-transfer
Synthesis of Secondary and Tertiary Alkylboranes via Formal Hydroboration of Terminal and 1,1-Disubstituted Alkenes
作者:Hilary A. Kerchner、John Montgomery
DOI:10.1021/acs.orglett.6b03090
日期:2016.11.4
terminal or 1,1-disubstituted alkenes with bis(pinacolato)diboron and methanol provides formal hydroboration products with exceptional regiocontrol favoring the branched isomer. Pairing this procedure with photocatalytic cross-couplings using iridium and nickel cocatalysis provides an effective, highlyregioselective procedure for the hydroarylation of terminal alkenes.