Stereocontrolled Synthesis of 1,5-Stereogenic Centers through Three-Carbon Homologation of Boronic Esters
作者:Phillip J. Unsworth、Daniele Leonori、Varinder K. Aggarwal
DOI:10.1002/anie.201405700
日期:2014.9.8
Allylic pinacol boronic esters are stable toward 1,3‐borotropic rearrangement. We developed a PdII‐mediated isomerization process that gives di‐ or trisubstituted allylic boronic esters with high E selectivity. The combination of this method with lithiation–borylation enables the synthesis of carbon chains that bear 1,5‐stereogeniccenters. The utility of this method has been demonstrated in a formal
Nickel-Catalyzed Umpolung Arylation of Ambiphilic α-Bromoalkyl Boronic Esters
作者:Shang-Zheng Sun、Ruben Martin
DOI:10.1002/anie.201712428
日期:2018.3.26
A nickel‐catalyzed reductive arylation of ambiphilic α‐bromoalkyl boronic esters with aryl halides is described. This platform provides an unrecognized opportunity to promote the catalytic umpolung reactivity of ambiphilic reagents with aryl halides, thus unlocking a new cross‐coupling strategy that complements existing methods for the preparation of densely functionalized alkyl‐substituted organometallic
Ni-Catalyzed Radical-Promoted Defluoroalkylborylation of Trifluoromethyl Alkenes To Access <i>gem</i>-Difluorohomoallylic Boronates
作者:Jian Qiu、Cece Wang、Lu Zhou、Yixian Lou、Kai Yang、Qiuling Song
DOI:10.1021/acs.orglett.2c00800
日期:2022.4.1
gem-difluoroalkenes and organoboroncompounds. However, the strategies for the construction of gem-difluorohomoallyl boronates has scarcely been described. Herein, we develop an efficient protocol for the construction of gem-difluorohomoallylic boronates through a Ni-catalyzed radical-promoted defluoroalkylborylation of α-trifluoromethyl alkenes with α-haloboronates under mild conditions. This reaction features a
gem -Difluoroalkenyl boronates 是用于构建各种gem -difluoroalkenes和有机硼化合物的有吸引力的合成子。然而,几乎没有描述构建偕二氟高烯丙基硼酸酯的策略。在此,我们开发了一种有效的方案,用于在温和条件下通过 Ni 催化的自由基促进的 α-三氟甲基烯烃与 α-卤代硼酸酯的脱氟烷基硼酸化来构建偕二氟高烯丙基硼酸酯。该反应具有广泛的底物范围、良好的官能团耐受性和多种转化。
Allylboronates from Vinyl Triflates and α-Chloroboronates by Reductive Nickel Catalysis
作者:Jin-Bao Qiao、Zhen-Zhen Zhao、Ya-Qian Zhang、Kai Yin、Zhi-Xiong Tian、Xing-Zhong Shu
DOI:10.1021/acs.orglett.0c01683
日期:2020.7.2
Allylboronates are unique buildingblocks widely used in organic synthesis, but the construction of cyclic allylboranates remains a challenging subject. We demonstrate here a mild and efficient access to this type of compound through the cross-electrophile coupling of vinyl triflates and α-chloroboronates. The reaction proceeded with a good substrate scope and good functional group compatibility. The
作者:Hayden A. Sharma、Jake Z. Essman、Eric N. Jacobsen
DOI:10.1126/science.abm0386
日期:2021.11.5
the construction of a wide variety of trisubstituted stereocenters through a catalytically accessed common chiral intermediate could prove highly enabling for the field of synthetic chemistry. We report the discovery of enantioselective, catalytic 1,2-boronate rearrangements for the synthesis of α-chloro pinacol boronic esters from readily available boronic esters and dichloromethane. The chiral building