Transformation of 1-(1,2-propadienyl)cyclopropanols into substituted hydroquinones employing octacarbonyldicobalt
摘要:
A novel transformation of 1-(1,2-propadieny])cyclopropanols into substituted 1,4-hydroquinones has been developed utilizing the interaction of 1.2-propadienes and octacarbonyldicobalt (Co-2(CO)(8)) This reaction was applied to the synthesis of vitamin E and K analogs. (C) 1997 Elsevier Science Ltd.
Copper catalyzed regioselective coupling of allylic halides and alkynes promoted by weak inorganic bases
作者:Lothar W. Bieber、Margarete F. da Silva
DOI:10.1016/j.tetlet.2007.08.010
日期:2007.10
Allylichalides and terminal alkynes couple under CuI catalysis in DMSO or DMF solution. In most cases, sodium carbonate or bicarbonate is sufficient to promote the reaction; less reactive alkynes require catalytic amounts of DBU. Bifunctional alkynes and halides can be reacted selectively according to the stoichiometry used. Trimethylsilyl, hydroxyl, ester and halide groups are tolerated in the alkyne
Convergent Synthesis of Trisubstituted <i>Z</i>-Allylic Esters by Wittig−Schlosser Reaction
作者:David M. Hodgson、Tanzeel Arif
DOI:10.1021/ol101843q
日期:2010.9.17
β-Lithiooxyphosphonium ylides, generated in situ from aldehydes and Wittig reagents, react readily with halomethyl esters to form trisubstituted Z-allylic esters. The methodology was applied to a total synthesis of the geranylgeraniol-derived diterpene (6S,7R,Z)-7-hydroxy-2-((E)-6-hydroxy-4-methylhex-4-enylidene)-6,10-dimethylundec-9-enyl acetate (12).
Photoassisted oxidation of ruthenium(<scp>ii</scp>)-photocatalysts Ru(bpy)<sub>3</sub><sup>2+</sup> and Ru(bpz)<sub>3</sub><sup>2+</sup> to RuO<sub>4</sub>: orthogonal tandem photoredox and oxidation catalysis
作者:Dirk Alpers、Malte Gallhof、Christian B. W. Stark、Malte Brasholz
DOI:10.1039/c5cc08994h
日期:——
Photoredox catalysts Ru(bpy)32+ and Ru(bpz)32+ are rapidly converted into RuO4 through continuous visible light irradiation in the presence of NaIO4. Tandem photoredox/oxidation catalysis protocols were developed.
A Radical Cyclisation Route to 3-Alkyl Furans. Synthesis of Perillene and Dendrolasin
作者:Adusumilli Srikrishna、Gajendran Sunderbabu
DOI:10.1246/cl.1988.371
日期:1988.2.5
A general three step synthesis of 3-alkyl furans, including Perillene and Dendrolasin, from alk-2-ynyl alcohols is described via radicalcyclisation of 2-bromo-1-ethoxyethyl alk-2-ynyl ethers to 2-ethoxy-4-alkylidene tetrahydrofurans.
monoterpenoid pheromone (+)-eldanolide, a long range sex attractant, has been synthesized in four steps from the chiral 2,3-epoxyalcohol 4 in 36% overall yield. Our synthetic strategy features the formation of a 1,3-diol by regio- and stereoselective ring opening of 2,3-epoxyalcohol 4, an intermediate easily available from Sharpless asymmetric epoxidation. Other key steps include one carbon elongation