A novel palladium-catalyzed regiocontrollable hydroarylation reaction of allenamides with B2pin2/H2O has been disclosed. H2O as an ideal hydrogen source was activated by B2pin2 to furnish allylamines or enamines with a broad functional group tolerance. The regioselectivity for both of the two products was up to 99 : 1 for most of the examples, which was achieved by adjusting the addition order of the
已经公开了新颖的钯催化的烯丙基酰胺与B 2 pin 2 / H 2 O的区域可控的氢芳基化反应。作为理想氢源的H 2 O被B 2 pin 2活化,以提供具有宽泛的官能团耐受性的烯丙胺或烯胺。在大多数实施例中,两种产物的区域选择性都高达99:1,这是通过调节催化剂和碘代苯衍生物的加成顺序来实现的。该机制的初步调查证明反应是一个非自由基处理和氘标记的实验表明,氢是选自H 2 O.
A Study of [Co2(alkyne)(binap)(CO)4] Complexes (BINAP=(1,1?-Binaphthalene)-2,2?-diylbis(diphenylphosphine))
作者:Susan E. Gibson、Karina A. C. Kaufmann、Jennifer A. Loch、Jonathan W. Steed、Andrew J. P. White
DOI:10.1002/chem.200401210
日期:2005.4.8
Pauson-Khand reaction. We have successfully characterized complexes of the type [Co2(alkyne)(binap)(CO)4] (BINAP=(1,1'-binaphthalene)-2,2'-diylbis(diphenylphosphine)) and shown that diastereomer interconversion occurs under Pauson-Khand reaction conditions when alkyne=HC[triple bond]CCO2Me. Attempts to isolate [Co2(alkyne)(binap)(CO)x] complexes with coordinated alkenes led to the formation of cobaltacyclopentadiene
了解手性配体,炔烃和烯烃与羰基钴的相互作用对于了解更多有关催化性,不对称Pauson-Khand反应机理的知识至关重要。我们已经成功地表征了类型[Co2(炔)(binap)(CO)4]的配合物(BINAP =(1,1'-联萘)-2,2'-二基双(二苯基膦)),并表明在以下条件下会发生非对映异构体互变炔烃= HC [三键] CCO2Me时的Pauson-Khand反应条件。尝试分离具有配位烯烃的[Co2(炔烃)(binap)(CO)x]配合物导致形成钴环戊二烯物种。
Pendant Alkenes Promote Cobalt−Cobalt Bond Cleavage in (Alkyne)(binap)tetracarbonyldicobalt(0) Complexes
作者:Susan E. Gibson、Karina A. C. Kaufmann、Peter R. Haycock、Andrew J. P. White、David J. Hardick、Matthew J. Tozer
DOI:10.1021/om070022v
日期:2007.3.1
Heating (alkyne)(binap)tetracarbonyldicobalt(0) complexes bearing pendant alkenes leads to cleavage of the cobalt−cobalt bond and generation of the mononuclear hydride (binap)(CO)2CoH at 45−55 °C.
A Study of (Binap)(enyne)tetracarbonyldicobalt(0) Complexes
作者:Susan E. Gibson、David J. Hardick、Peter R. Haycock、Karina A. C. Kaufmann、Ayako Miyazaki、Matthew J. Tozer、Andrew J. P. White
DOI:10.1002/chem.200700587
日期:2007.8.27
Four (binap)(enyne)tetracarbonyldicobalt(0) complexes have been synthesised and their reactivity monitored by variable temperature (31)P NMR spectroscopy. Formation of (binap)dicarbonylhydridocobalt(-1) 12 occurred at temperatures between 35 and 55 degrees C, depending on the nature of the alkene and alkyne components of the enyne. The structure of 12 was determined by X-ray crystallography, and its
Oxidant-dependent Cu-catalyzed alkynylation and aminomethylation: C–H versus C–C cleavage in TMEDA
作者:Qi Shen、Lei Zhang、Yu-Ren Zhou、Jian-Xin Li
DOI:10.1016/j.tetlet.2013.09.118
日期:2013.12
Oxidant-dependent Cu-catalyzed alkynylation and aminomethylation reactions have been achieved under facile and mild conditions. TMEDA coupled with various terminal alkynes via C-H bond cleavage in good yields using atmospheric oxygen as an oxidant. Switching from air to TBHP afforded aminomethylation products of terminal alkynes through C-C bond cleavage of TMEDA. The protocol provided a novel strategy to prepare bi/tridentate N-ligand. (C) 2013 Elsevier Ltd. All rights reserved.