CATALYSTS AND PROCESSES FOR THE HYDROGENATION OF AMIDES
申请人:Bergens Steven
公开号:US20140163225A1
公开(公告)日:2014-06-12
There is provided a process for the reduction of one or more amide moieties in a compound comprising contacting the compound with hydrogen gas and a transition metal catalyst in the presence or absence of a base under conditions for the reduction an amide bond. The presently described processes can be performed at low catalyst loading using relatively mild temperature and pressures, and optionally, in the presence or absence of a base or high catalyst loadings using low temperatures and pressures and high loadings of base to effect dynamic kinetic resolution of achiral amides.
investigated in various reactions [such as diazo function elimination and O–H insertion under AgOTf and Rh2(OAc)4 catalysis, respectively]. These compounds are stable if the substituent on the nitrogenatom efficiently conjugates with the carbonyl group.
Domino Synthesis of α,β‐Unsaturated γ‐Lactams by Stereoselective Amination of α‐Tertiary Allylic Alcohols
作者:Jianing Xie、Sijing Xue、Eduardo C. Escudero‐Adán、Arjan W. Kleij
DOI:10.1002/anie.201810160
日期:2018.12.17
alcohols equipped with a carboxyl group can be smoothly aminated under ambient conditions by a conceptually new and stereoselective protocol under palladium catalysis. The in situ formed Z‐configured γ‐amino acid cyclizes to afford an α,β‐unsaturated γ‐lactam, releasing water as the only byproduct. This practical catalytic transformation highlights the use of a carboxyl group acting as an activating
Synthesis of Nitrogen-Containing Heterocycles via Ring-Closing Ene-Ene and Ene-Yne Metathesis Reactions: An Easy Access to 1- and 2-Benzazepine Scaffolds and Five- and Six-Membered Lactams
derivative. By modifying the structure of the starting materials, the optimized cyclization finally proved to be a suitable technique to obtain five- and six-membered lactams, enhancing the synthetic application of our method. Five- and six-membered lactams were efficiently prepared by ring-closing metathesis involving the loss of ethylene moiety and affording highly functionalizable compounds showing both
α‐diazo‐γ‐butyrolactams provides a straightforward access to α‐aryl(alkyl)thiolactams. The same diazo lactams can be easily converted to β‐aryl(alkyl)thiolactams through AgI‐catalyzed β‐hydride shift followed by a sulfa‐Michael addition. These two reactions of α‐diazo‐γ‐butyrolactams pave the way toward two medicinallyimportantscaffolds.