Microwave-Assisted Organocatalyzed Rearrangement of Propargyl Vinyl Ethers to Salicylaldehyde Derivatives: An Experimental and Theoretical Study
作者:David Tejedor、Leandro Cotos、Daniel Márquez-Arce、Mikel Odriozola-Gimeno、Miquel Torrent-Sucarrat、Fernando P. Cossío、Fernando García-Tellado
DOI:10.1002/chem.201503171
日期:2015.12.7
monocycles to complex fused polycyclic systems. The reaction is highly regioselective and takes place under symmetry‐breaking conditions. The preparative power of this reaction was demonstrated in the first total synthesis of morintrifolin B, a benzophenone metabolite isolated from the small tree Morinda citrifolia L. A DFT study of the reaction was performed with full agreement between calculated values and
Efficient methods of synthesis of unsaturated alcohols and ketones by allylation of Favorsky reaction products under phase transfer conditions
作者:V. A. Potapov、T. I. Yaroshenko、V. A. Panov、M. V. Musalov、A. G. Khabibulina、M. V. Musalova、S. V. Amosova
DOI:10.1134/s1070428016120034
日期:2016.12
Allylation of the Favorsky reaction products with allyl halides under phase-transfer catalysis in the system CuI–K2CO3–Na2SO3–BTEAC–H2O–C6H6 afforded the corresponding allylpropargyl alcohols in high yields (87–96%). The procedure is practical and scalable (more than 50 g of the target product can be prepared in a single run) and is characterized by high selectivity. Oxidation of secondary allylpropargyl
在相转移催化下,CuI–K 2 CO 3 –Na 2 SO 3 –BTEAC–H 2 O–C 6 H 6体系中的Favorsky反应产物与烯丙基卤的烯丙基化可提供高收率的相应的烯丙基炔丙醇(87– 96%)。该方法是实用且可扩展的(一次可制备50克以上目标产品),并且具有高选择性的特点。在室温下,用二氧化锰在无水乙腈中氧化仲烯丙基炔丙醇,可得到75-81%的烯丙基炔酮。
Intramolecular Benzannulation Reactions of Chromium Siloxycarbene Complexes: Regiochemical Control and the "Xenochemical Effect" of Alkyne Additives
作者:Michael F. Gross、M. G. Finn
DOI:10.1021/ja00103a007
日期:1994.11
Acetylenic alcohols are attached to chromium oxycarbene fragments via dialkylsilicon linkages in convenient fashion to provide siloxycarbene complexes which undergo intramolecular benzannulation upon heating. Yields of alkynol-derived quinone products after oxidative workup increase markedly when the reactions are conducted in the presence of the ''external'' alkynes diphenylacetylene, 3-hexyne, or 1-hexyne. The action of alkyne additives, which participate in competitive intermolecular benzannulation to only a minor extent, is inhibited by donor solvent or carbon monoxide. Kinetics measurements demonstrate that the benzannulation reactions are initiated by dissociative CO loss. The alkyne additives are believed tb act by coordination to vinylcarbene intermediates produced by intramolecular alkyne insertion, consistent with previous suggestions. A carbon-tethered analogue was found to be unresponsive to the addition of external alkyne. Evidence for the reversible nature of alkyne insertion and the bimolecular decomposition of siloxycarbene complexes is discussed. The methodology provides products with complete regiospecificity regardless of the size of the tethered alkyne substituents, including those not directly accessible by intermolecular reactions of terminal alkynes.
Synthesis of Fatty Acids with Smooth Muscle Stimulant Activity
作者:E. Crundwell、M. A. Pinnegar、W. Templeton
DOI:10.1021/jm00325a010
日期:1965.1
The synthesis of nanaomycin A and deoxyfrenolicin by alkyne cycloaddition to chromium-carbene complexes
作者:M. F. Semmelhack、Joseph J. Bozell、Tadahisa Sato、W. Wulff、E. Spiess、A. Zask