Preparation of allyl-, alkenyl- and of functionalized arylmanganese reagents by oxidative insertion of manganese-graphite into organic halides
作者:Alois Fürstner、Heiko Brunner
DOI:10.1016/0040-4039(96)01591-2
日期:1996.9
THF affords highly active Mn-graphite, which readily inserts into allyl-, alkenyl-, (substituted) aryl- and heteroaryl halides. The functionalized organomanganese compounds thus obtained may be efficiently trapped with different electrophiles such as aldehydes, anhydrides and acid chlorides, or can be cross-coupled with alkenyl halides in the presence of catalytic amounts of Fe(acac)3.
在THF中用2 C 8 K还原MnBr 2 · n LiBr(n = 1,2),得到高活性的Mn-石墨,它容易插入烯丙基-,烯基-,(取代的)芳基-和杂芳基卤化物中。如此获得的官能化的有机锰化合物可以有效地被不同的亲电子试剂(例如醛,酸酐和酰氯)捕获,或者可以在催化量的Fe(acac)3存在下与链烯基卤化物交联。
Gold (I/III)‐Catalyzed Trifluoromethylthiolation and Trifluoromethylselenolation of Organohalides
作者:Sagar R. Mudshinge、Yuhao Yang、Bo Xu、Gerald B. Hammond、Zhichao Lu
DOI:10.1002/anie.202115687
日期:2022.3.14
The first gold(I/III)-catalyzed direct trifluoromethylthiolation and trifluoromethylselenolation of organohalides are reported. This mild and efficient protocol enjoys a broad substrate scope and high yield (>60 examples with up to 97 % isolated yield). Its robustness was demonstrated by the late-stage functionalization of various bioactive molecules, which makes this reaction applicable to pharmaceutical
Selective Ni-catalyzed cross-electrophile coupling of alkynes, fluoroalkyl halides, and vinyl halides
作者:Yubei Dai、Fang Wang、Shengqing Zhu、Lingling Chu
DOI:10.1016/j.cclet.2021.12.050
日期:2022.8
We report a Ni-catalyzed three-component cross-electrophile coupling of alkynes with alkenyl halides and fluoroalkyl halides to generate fluoroalkyl-incorporated 1,3-dienes. This mild and operationally simple protocol is distinguished by its broad substrate scope and excellent chemo-, regio-, and stereo-selectivity, offering a new and organometallic agent-free platform for the construction of fluo
我们报道了一种 Ni 催化的炔烃与烯基卤化物和氟代烷基卤化物的三组分交叉亲电偶联,以生成掺有氟代烷基的 1,3-二烯。这种温和且操作简单的协议以其广泛的底物范围和出色的化学、区域和立体选择性而著称,为构建含氟烷基的二烯基序提供了一个新的无有机金属试剂平台。已经进行了初步的机理研究以探索潜在的反应途径。
Copper-Catalyzed Direct Alkenylation of<i>N</i>-Iminopyridinium Ylides
作者:James J. Mousseau、James A. Bull、André B. Charette
DOI:10.1002/anie.200906020
日期:2010.2.1
A versatile Cu‐catalyzed direct CH alkenylation of N‐iminopyridinium ylides, compatible with several different copper sources (including a penny), provides a powerful and inexpensive method for the synthesis of functionalized pyridine derivatives. Chemoselective functionalization of halide‐containing compounds allows the synthesis of alkenyl pyridines containing reactive tethers for further functionalization
Aminocarbonylation of alkenyl iodides with CO and amines proceeded under heating to produce α,β-unsaturatedamides in good yields (23 examples, 71% average yield). This catalyst-free method exhibited good functional-group tolerance, and open a straightforward access to functionalized acrylamides, as illustrated by the synthesis of Ilepcimide. A hybrid radical/ionic mechanism involving chain electron transfer is
烯基碘与 CO 和胺的氨基羰基化在加热下进行,以良好的产率(23 个实例,71% 的平均产率)产生 α,β-不饱和酰胺。这种无催化剂的方法表现出良好的官能团耐受性,并打开了对官能化丙烯酰胺的直接访问,如 Ilepcimide 的合成所示。针对这种转变提出了一种涉及链式电子转移的混合自由基/离子机制。