Application of intramolecular Dötz reaction to the synthesis of ansa-compounds: concise synthesis of arnebinol
摘要:
Fischer carbene complexes having long alkynyloxy chains regioselectively produced oxametacyclophanes via the intramolecular Dotz reaction. The utility of this reaction was demonstrated in the synthesis of arnebinol, an ansa-type terpenoid, from geranyl acetate in six steps. (c) 2006 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Cross-Coupling of Alkynylzincs with Allylic Electrophiles: An Efficient and Selective Synthesis of Stereo- and Regio-Defined 1,4-Enynes
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
Palladium-catalyzed Substitution Reaction of Allylic Derivatives with Tinacetylene
作者:Toshio NISHIKAWA、Minoru ISOBE
DOI:10.1271/bbb.63.238
日期:1999.1
The substitution reaction of allylic derivatives (acetate, carbonate, and chloride) with tinacetylene proceeded in the presence of palladium as a catalyst to give a product having a 1-ene-4-yne system.
Palladium-Catalyzed Cross-Coupling of Alkynylzincs with Allylic Electrophiles: An Efficient and Selective Synthesis of Stereo- and Regio-Defined 1,4-Enynes
作者:Ei-ichi Negishi、Mingxing Qian
DOI:10.1055/s-2005-871560
日期:——
Clean and high-yielding cross-coupling of alkynylzincs with allylic chlorides, bromides, or acetates exhibiting 98% regio- and stereoselectivity can be achieved by using 1 mol% of Pd(DPEphos)Cl2 and either 1:1 THF-DMF or pure DMF. This reaction provides a satisfactory route to 1,4-enynes via Pd-catalyzed alkynyl-allyl coupling.
Fischer carbene complexes having long alkynyloxy chains regioselectively produced oxametacyclophanes via the intramolecular Dotz reaction. The utility of this reaction was demonstrated in the synthesis of arnebinol, an ansa-type terpenoid, from geranyl acetate in six steps. (c) 2006 Elsevier Ltd. All rights reserved.