Stereoselective synthesis of cyclopentanols by Lewis acid-mediated [3+2] annulation of allyldiisopropylphenylsilane with α,β-unsaturated diesters
摘要:
ZrCl4-mediated annulation of allyldiisopropylphenylsilane with alpha,beta-unsaturated diesters and subsequent oxidative cleavage of the carbon-silicon bond furnished cyclopentanols highly stereoselectively. (C) 1998 Elsevier Science Ltd. All rights reserved.
Catalytic alkylation of remote C–H bonds enabled by proton-coupled electron transfer
作者:Gilbert J. Choi、Qilei Zhu、David C. Miller、Carol J. Gu、Robert R. Knowles
DOI:10.1038/nature19811
日期:2016.11
unfunctionalized amides to direct the formation of new C–C bonds. Given the prevalence of amides in pharmaceuticals and natural products, we anticipate that this method will simplify the synthesis and structural elaboration of amine-containing targets. Moreover, this study demonstrates that concerted proton-coupled electron transfer can enable homolytic activation of common organic functional groups
Copper Catalyzed C(sp<sup>3</sup>)–H Bond Alkylation via Photoinduced Ligand-to-Metal Charge Transfer
作者:Sean M. Treacy、Tomislav Rovis
DOI:10.1021/jacs.1c00687
日期:2021.2.24
(0.5 V vs SCE) and that a proposed protodemetalation mechanism offers a broad scope of electron-deficient olefins, offering high diastereoselectivity in the case of endocyclic alkenes. The coupling of chlorine radical generation with Cu reduction through LMCT enables the generation of a highly active HAT reagent in an operationally simple and atom economical protocol.
我们利用催化 CuCl 2报告了通过未活化的 C(sp 3 )-H 键与缺电子烯烃的偶联对许多原料化学品的功能化。活性铜酸盐催化剂经历配体到金属电荷转移 (LMCT) 以产生氯自由基,该氯自由基充当强大的氢原子转移试剂,能够提取强富电子 C(sp 3)–H 键。值得注意的是,氯铜酸盐催化剂是一种非常温和的氧化剂(0.5 V vs SCE),并且提出的原型脱金属机制提供了广泛的缺电子烯烃,在环烯烃的情况下提供了高非对映选择性。通过 LMCT 将氯自由基生成与 Cu 还原相结合,能够以操作简单且原子经济的方案生成高活性 HAT 试剂。
2,3-DIPHENYL-VALERONITRILE DERIVATIVES, METHOD FOR THE PRODUCTION THEREOF AND USE THEREOF AS HERBICIDES AND PLANT GROWTH REGULATORS
申请人:Mosrin Marc
公开号:US20140235446A1
公开(公告)日:2014-08-21
The compounds of the formula (I)
in which
L represents a radical of the formula
and
A
1
, B
1
and A
2
and B
2
are as defined in Claim
1,
are suitable as herbicides for the control of harmful plants or as plant growth regulators.
The compounds can be prepared by the process of Claim
12.
Enantioselective (4+2) Annulation of Donor-Acceptor Cyclobutanes by N-Heterocyclic Carbene Catalysis
作者:Alison Levens、Adam Ametovski、David W. Lupton
DOI:10.1002/anie.201609330
日期:2016.12.23
Herein we report the enantioselective (4+2) annulation of donor–acceptor cyclobutanes and unsaturated acyl fluorides using N‐heterocycliccarbenecatalysis. The reaction allows a 3‐step synthesis of cyclohexyl β‐lactones (25 examples) in excellent chemical yield (most ≥90 %) and stereochemical integrity (all >20:1 d.r., most ≥97:3 e.r.). Mechanistic studies support ester enolate Claisen rearrangement