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。
Vitamin-Synthesen mit Carben-Komplexen, III [1]. Stereospezifische Synthese von Alkenylcarben-Komplexen des Chroms / Vitamin Syntheses via Carbene Complexes, III [1]. Stereospecific Synthesis of Alkenylcarbene Chromium Complexes
Simultaneous and Stereoselective Construction of Planar and Axial Centers of Chirality
作者:Louis Fogel、Richard P. Hsung、William D. Wulff、Roger D. Sommer、Arnold L. Rheingold
DOI:10.1021/ja010091f
日期:2001.6.1
all of these alkynes, the reaction products could be completely isomerized to the anti isomer by performing the reaction at 120 °C except for the smaller ortho methoxyl complex which only required 50 °C for complete conversion. This includes the very hindered tertbutyl complex3i which was formed as a slightly preferred kinetic product having the syn stereochemistry which was determined by X-ray diffraction
Alkyne Competition in the Benzannulation Reaction with Chromium Carbene Complexes
作者:Chunrui Wu、Dmytro O. Berbasov、William D. Wulff
DOI:10.1021/jo100433k
日期:2010.7.2
The benzannulation reaction of Fischer carbenecomplexes is investigated under conditions where the reaction of the carbenecomplex is occurring in the presence of two different alkynes. A series of competition experiments are examined where the effects of various structural factors are explored by pitting 10 different carbenecomplexes with 11 different alkynes. Terminal alkynes will react selectively
Annulation of furan-bridged 10-membered rings on N-heterocycles through [8+2] cycloaddition of dienylazaisobenzofurans and dimethyl acetylenedicarboxylate
作者:Priyabrata Roy、Binay K. Ghorai
DOI:10.1016/j.tetlet.2011.08.094
日期:2011.10
One-pot three-componentcoupling of o-alkynylheteroaryl carbonyl derivatives with α,β-unsaturated Fischer carbene complexes and dimethyl acetylenedicarboxylate leading to the synthesis of heterocyclic analogues of furanophane derivatives has been explored. This involves the generation of conformationally flexible dienylazaisobenzofuran intermediate as transient intermediates, which undergo [8+2] cycloaddition