Ti-Catalyzed Barbier-Type Allylations and Related Reactions
作者:Rosa E. Estévez、José Justicia、Btissam Bazdi、Noelia Fuentes、Miguel Paradas、Duane Choquesillo-Lazarte、Juan M. García-Ruiz、Rafael Robles、Andreas Gansäuer、Juan M. Cuerva、J. Enrique Oltra
DOI:10.1002/chem.200802180
日期:2009.3.9
Versatility of titanium: Titanocene(III) complexes catalyze Barbier‐type allylations, intramolecular crotylations (cyclizations), and prenylations of a wide range of aldehydes and ketones. These reactions take place at RT under mild conditions compatible with many functional groups; provide good yields of open‐chain and cyclic homoallylic alcohols, including heterocyclic derivatives; and can be conducted
All at once: The simultaneous synthesis and enantioselectivefunctionalization of an indole core is achieved with the assistance of chiral cationic AuI complexes. A range of vinyloxazino‐[4,3‐a]indoles is obtained by a cascade process in a highly enantioselective manner (see scheme; L=chiral diphosphine).
一次:在手性阳离子Au I配合物的帮助下,吲哚核同时合成和对映选择性官能化。通过级联工艺以高度对映选择性的方式获得了一系列乙烯基恶嗪基[4,3- a ]吲哚(参见方案;L =手性二膦)。
Palladium-Catalyzed Intramolecular Coupling between Aryl Iodides and Allyl Moieties via Thermal and Microwave-Assisted Conditions
作者:Mark Lautens、Eiji Tayama、Christelle Herse
DOI:10.1021/ja043898r
日期:2005.1.1
Palladium-catalyzed intramolecular cross-coupling reactions between aryl iodides and allyl moieties were successfully demonstrated in the presence of palladium catalyst, tri-o-tolylphosphine, a tertiary amine, and water. Several kinds of trans-2,4-disubstituted 1,2,3,4-tetrahydroquinolines were synthesized in 73-88% yields with excellent diastereoselectivities. This method was further applied to a
Divergent Titanium‐Mediated Allylations with Modulation by Nickel or Palladium
作者:Araceli G. Campaña、Btissam Bazdi、Noelia Fuentes、Rafael Robles、Juan M. Cuerva、J. Enrique Oltra、Susana Porcel、Antonio M. Echavarren
DOI:10.1002/anie.200802520
日期:2008.9.15
Sodium Tetramethoxyborate: An Efficient Catalyst for Michael Additions of Stabilized Carbon Nucleophiles
作者:Araceli G. Campaña、Noelia Fuentes、Enrique Gómez-Bengoa、Cristina Mateo、J. Enrique Oltra、Antonio M. Echavarren、Juan M. Cuerva
DOI:10.1021/jo701354c
日期:2007.10.1
[GRAPHICS]Sodium tetramethoxyborate, easily prepared by reaction of inexpensive sodium borohydride with methanol, possesses a suitable combination of a Lewis base and a Lewis acid to catalyze Michael reactions at room temperature under practically neutral conditions. This reaction provides good to excellent yields of Michael addition products from a broad scope of Michael donor and Michael acceptor reagents.