Amide α,β-Dehydrogenation Using Allyl-Palladium Catalysis and a Hindered Monodentate Anilide
摘要:
A practical and direct method for the alpha,beta-dehydrogenation of amides is reported using allyl-palladium catalysis. Critical to the success of this process was the synthesis and application of a novel lithium N-cyclohexyl anilide (LiCyan). The reaction conditions tolerate a wide variety of substrates, including those with acidic heteroatom nucleophiles.
Asymmetric Conjugate Additions of Chiral Phosphonamide Anions to α,β-Unsaturated Carbonyl Compounds. A Versatile Method for Vicinally Substituted Chirons
作者:Stephen Hanessian、Arthur Gomtsyan、Nadia Malek
DOI:10.1021/jo000388g
日期:2000.9.1
Reactions of anions derived from chiral nonracemic allyl, crotyl, and cinnamyl bicyclic C(2)-symmetrical phosphonamides with alpha, beta-unsaturated cyclic ketones, esters, lactones, and lactams take place at the gamma-position of the reagents. The products are diastereomerically pure or enriched beta-substituted carbonylcompounds. The method also provides easy access to vicinal substitution of as
Compounds useful as HCV anti-infectives are disclosed. Also disclosed are methods of making and using the same.
抗丙型肝炎病毒感染的有用化合物已被披露。同时还披露了制备和使用这些化合物的方法。
Synthesis of 3-Ethyl-4-methyl-1,5-dihydro-2H-pyrrol-2-one by Novel Palladium(II)-Catalyzed Cyclization and Ring-Closing Metathesis
作者:Subhash Chavan、Ashok Pathak、Kailash Pawar
DOI:10.1055/s-0034-1379985
日期:——
Abstract Synthesis of 3-ethyl-4-methyl-1,5-dihydro-2H-pyrrol-2-one is described starting from commercially available allylamine and 4-methoxybenzylamine employing palladium-catalyzed cyclization or ring-closingmetathesis as the keysteps. Synthesis of 3-ethyl-4-methyl-1,5-dihydro-2H-pyrrol-2-one is described starting from commercially available allylamine and 4-methoxybenzylamine employing palladium-catalyzed
Denmark’s chiral bisphosphoramide/silicon tetrachloride system performs as an excellent Lewis base-Lewis acid catalyst for the vinylogous Mukaiyama aldol reaction of pyrrole- and furan-based dienoxy silanes with aromatic and heteroaromatic aldehydes. This asymmetric methodology provides a powerful synthetic entry to a variety of δ-hydroxylated γ-butenolide-type frameworks with high efficiency and valuable
A unified total synthesis of stemoamide-type alkaloids is reported. Our synthetic approach features the chemoselective convergent assembly of five-membered buildingblocks via stemoamide as the common precursor to tetracyclic natural products. The synthesis consists of two successive coupling reactions of the three five-membered buildingblocks. The first coupling reaction is the vinylogous Michael