Organoboranes. 32. Homologation of alkylboronic esters with methoxy(phenylthio)methyllithium: regio- and stereocontrolled aldehyde synthesis from olefins via hydroboration
作者:Herbert C. Brown、Toshiro Imai
DOI:10.1021/ja00358a017
日期:1983.9
L'homologation d'alkyl-2 dioxaborinannes-1,3,2(I) en derives α-methoxyalkyl-2 (II) est realisee par reaction avec LiCH(OCH 3 )SC 6 H 5 suivie d'un traitement par HgCl 2 . Les intermediaires (II) sont oxydees par H 2 O 2 en tampon phosphate pour donner les aldehydes correspondants. Les groupes alkyles de (I) sont introduits par borhydratation
L'homologation d'alkyl-2 dioxaborinannes-1,3,2(I) en衍生α-甲氧基烷基-2 (II) est realisee par反应avec LiCH(OCH 3 )SC 6 H 5 suvie d'un traitement par HgCl 2 . Les intermediaires (II) sont oxydees par H 2 O 2 en tampon phosphate pour donner les aldehydes 通讯员。Les groupesalkales de (I) sont 介绍了par borhydration
Homologation of representative boronic esters using in situ generated (halomethyl)lithiums: A comparative study
作者:Raman Soundararajan、Guisheng Li、Herbert C. Brown
DOI:10.1016/0040-4039(94)88399-8
日期:1994.11
A comparativestudy of the homologation of representativeboronicesters with in situgenerated LiCH2X (X= Cl; Br; I) is presented wherein the reactivity differences arising out of the steric and electronic effects of the migrating groups, and the nature of the ester groups are determined and discussed.
How Big is the Pinacol Boronic Ester as a Substituent?
作者:Valerio Fasano、Aidan W. McFord、Craig P. Butts、Beatrice S. L. Collins、Natalie Fey、Roger W. Alder、Varinder K. Aggarwal
DOI:10.1002/anie.202007776
日期:2020.12.7
pinacol boronicester group (Bpin) is generally thought of as a bulky moiety because of the two adjacent quaternary sp3‐hydribized carbon atoms in its diol backbone. However, recent diastereoselective reactions reported in the literature have cast doubt on this perception. Reported herein is a detailed experimental and computational analysis of Bpin and structurally related boronicesters which allows
Alkyl Radical Generation from Alkylboronic Pinacol Esters through Substitution with Aminyl Radicals
作者:Zhe Wang、Nick Wierich、Jingjing Zhang、Constantin G. Daniliuc、Armido Studer
DOI:10.1021/jacs.3c01129
日期:2023.4.26
Alkylboronic pinacol esters (APEs) are highly versatile reagents in organic synthesis. However, the direct generation of alkyl radicals from commonly used, bench-stable APEs has not been well explored. In this communication, alkyl radical generation from APEs through reaction with aminyl radicals is reported. The aminyl radicals are readily generated by visible-light-induced homolytic cleavage of the
烷基硼频哪醇酯 (APE) 是有机合成中用途广泛的试剂。然而,从常用的、实验室稳定的 APEs 直接产生烷基自由基的方法尚未得到很好的探索。在此通讯中,报道了 APE 通过与氨基自由基反应生成烷基自由基。氨基自由基很容易通过可见光诱导的 N-亚硝胺中 N-N 键的均裂裂解产生,而 C 自由基的产生通过硼的核均裂取代发生。作为一项应用,提出了在温和条件下烯烃与 APE 和N-亚硝胺的高效光化学自由基烷基肟化反应。范围广泛的一级、二级和三级 APEs 参与了这种很容易扩大规模的转变。
Deboronative functionalization of alkylboron species via a radical-transfer strategy
作者:Fuyang Yue、Mingxing Li、Kangkang Yang、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d4sc02889a
日期:——
With advances in organoboron chemistry, boron-centered functional groups have become increasingly attractive. In particular, alkylboron species are highly versatile reagents for organic synthesis, but the direct generation of alkyl radicals from commonly used, bench-stable boron species has not been thoroughly investigated. Herein, we describe a method for activating C–B bonds by nitrogen- or oxygen-radical
随着有机硼化学的进步,以硼为中心的官能团变得越来越有吸引力。特别是,烷基硼物质是用于有机合成的高度通用的试剂,但从常用的、实验室稳定的硼物质直接生成烷基自由基尚未得到彻底研究。在此,我们描述了一种通过氮或氧自由基转移激活 C-B 键的方法,该方法适用于烷基硼酸和酯,并且可用于 Michael 加成反应和 Minisci 反应以生成烷基或芳基化产物。