Traceless Stereoinduction in the One-Pot Assembly of All Three Rings of Hexahydrodibenzopyrans
作者:Keith A. Korthals、William D. Wulff
DOI:10.1021/ja077579m
日期:2008.3.1
stereochemical information from the chiral center at the propargylic ether in the alkyne to the planar center of chirality in the in situ generated arene chromium tricarbonyl complexed intermediate and finally, after base-induced elimination to generate an o-quinone methide chromium tricarbonyl complexed intermediate, a transfer of chiralityfrom the planar center of chirality in the o-quinone methide
A General and Regioselective Synthesis of Cyclopentenone Derivatives through Nickel(0)-Mediated [3 + 2] Cyclization of Alkenyl Fischer Carbene Complexes and Internal Alkynes
作者:José Barluenga、Pablo Barrio、Lorena Riesgo、Luis. A. López、Miguel Tomás
DOI:10.1021/ja075106+
日期:2007.11.1
2-cyclopentenone derivatives 3-6 are synthesized by the nickel(0)-mediated [3 + 2] cyclizationreaction of chromium alkenyl(methoxy)carbenecomplexes1 and internal alkynes2. The reaction takes place with complete regioselectivity with both unactivated alkynes and activated alkynes (electron-withdrawing and electron-donating substituted alkynes). Representative cycloadducts containing boron and tin
Simultaneous Synthesis of Both Rings of Chromenes via a Benzannulation/<i>o</i>-Quinone Methide Formation/Electrocyclization Cascade
作者:Nilanjana Majumdar、Keith A. Korthals、William D. Wulff
DOI:10.1021/ja210655g
日期:2012.1.18
A new route to the chromene ring system has been developed which involves the reaction of an α,β-unsaturated Fischer carbenecomplex of chromium with a propargyl ether bearing an alkenyl group on the propargylic carbon. This transformation involves a cascade of reactions that begins with a benzannulation reaction and is followed by the formation of an o-quinone methide, and finally results in the emergence
开发了一种色烯环体系的新路线,该路线涉及铬的α,β-不饱和费歇尔卡宾络合物与在炔丙碳上带有烯基的炔丙醚的反应。这种转化涉及一系列反应,从苯并环化反应开始,然后形成邻醌甲基化物,最后在电环化时产生色烯。通过使用芳基卡宾络合物,该反应被扩展以提供通路。这是色烯的首次合成,其中色烯系统的两个环均在一步中生成,并在 lapachenole 和维生素 E 的合成中得到突出体现。
New Fischer Carbene Complexes of Rhodium(I): Preparation and 2-Cyclopentenone Ring Synthesis by Annelation to Alkynes
作者:José Barluenga、Rubén Vicente、Luis A. López、Eduardo Rubio、Miguel Tomás、Carmen Álvarez-Rúa
DOI:10.1021/ja038817q
日期:2004.1.1
A new type of metal carbene complexes of group 9, specifically a cationic Fischer carbene of rhodium(I), has been synthesized from chromium carbene complexes via double transfer of carbene and CO ligands. These complexes reveal a different reactivity than other transition metal carbenes, including their chromium precursors, toward neutral and electron-poor alkynes, giving selectively polysubstituted
已经从铬卡宾配合物通过卡宾和 CO 配体的双重转移合成了一种新型的第 9 族金属卡宾配合物,特别是铑 (I) 的阳离子费歇尔卡宾。这些配合物显示出与其他过渡金属卡宾(包括其铬前体)对中性和缺电子炔的反应性不同,从而产生选择性多取代的环戊烯酮。
Carbene Transfer Reactions from Chromium(0) to Gold(I): Synthesis and Reactivity of New Fischer-Type Gold(I) Alkenyl Carbene Complexes
作者:Martín Fañanás-Mastral、Fernando Aznar
DOI:10.1021/om801146z
日期:2009.2.9
The synthesis of new cationic alkenyl Fischer-type gold(I) complexes through a carbene transfer reaction of chromium and tungsten alkenyl Fischer carbene complexes with LAuICl complexes in the presence of AgSbF6 is reported. The stability of the resulting gold(I) carbene complexes highly depends on the nature of the ligand (L). We have used unstable gold(I) carbene complexes for developing some catalytic
据报道,在AgSbF 6存在下,通过铬和钨烯基菲舍尔卡宾配合物与LAu I Cl配合物的卡宾转移反应,可以合成新的阳离子烯基菲舍尔型金(I)配合物。所得金(I)卡宾配合物的稳定性高度取决于配体(L)的性质。我们已使用不稳定的金(I)卡宾配合物开发了Fischer卡宾配合物的某些催化反应。