Medium sized trans-cycloalkenes are unusually reactive in the intermolecular Pauson-Khand reaction (PKR) with regard to typical monocyclic alkenes. This is due to the ring strain imparted by the E stereochemistry. The PKR of these alkenes offers a modular, regioselective and straightforward entry to trans fused [n.3.0] bicyclic scaffolds (n = 6-8).
Understanding Initiation with Triethylboron and Oxygen: The Differences between Low-Oxygen and High-Oxygen Regimes
作者:Dennis P. Curran、Timothy R. McFadden
DOI:10.1021/jacs.6b04014
日期:2016.6.22
unified kinetic theory for both initiation and autoxidationreactions of Et3B and O2 is put forth, and then divided into low-oxygen and high-oxygen experimental regimes for application of Et3B/O2 as an initiating system. In the low-oxygen regime, only long, efficient chains can be initiated. In the high-oxygen regime, less efficient chains can be initiated but they must compete with autoxidation. We apply
Highly Chemo- and Stereoselective Transfer Semihydrogenation of Alkynes Catalyzed by a Stable, Well-Defined Manganese(II) Complex
作者:Aleksandra Brzozowska、Luis Miguel Azofra、Viktoriia Zubar、Iuliana Atodiresei、Luigi Cavallo、Magnus Rueping、Osama El-Sepelgy
DOI:10.1021/acscatal.8b00983
日期:2018.5.4
unprecedented manganese-catalyzed semihydrogenation of internal alkynes to (Z)-alkenes using ammonia borane as a hydrogen donor. The reaction is catalyzed by a pincer complex of the earth-abundant manganese(II) salt in the absence of any additives, base, or superhydride. The ammonia borane smoothly reduces the manganese precatalyst [Mn(II)–PNP][Cl]2 to the catalytically activespecies [Mn(I)–PNP]–hydride in the
1,5-Cyclooctadiene as a bis-homodiene partner in a metal-catalyzed [4 + 2]cycloaddition
作者:Barry M. Trost、Katsuharu Imi、Adriano F. Indolese
DOI:10.1021/ja00072a043
日期:1993.9
Copper(<scp>i</scp>)-catalysed transfer hydrogenations with ammonia borane
作者:Eva Korytiaková、Niklas O. Thiel、Felix Pape、Johannes F. Teichert
DOI:10.1039/c6cc09067b
日期:——
Highly Z-selective alkyne transfer semihydrogenations and conjugate transferhydrogenations of enoates can be effected by employing a readily available copper(I)/N-heterocyclic carbene (NHC) complex, [IPrCuOH], in combination with ammoniaborane as a H2 equivalent.