An efficient and room-temperature procedure is developed for high yield synthesis of novel α,β-unsaturated derivatives of thiopyran 3 directly from ketone 1 and various aldehydes in the presence of catalytic quantities of TMSNMe2 and MgBr2˙OEt2 under solvent-free conditions. The main advantage of the procedure is that the formation of the undesired bis by-products is minimized. In addition, the procedure
An earth-abundant transition-metal copper catalyzed asymmetrichydrogenation of exocyclic α,β-unsaturated pentanones affording the corresponding chiral exocyclic allylic pentanols in up to 99 % yield and 96 % ee (enantiomeric excess) is reported. Mechanistic studies indicate that only the C=O bond is chemoselectively reduced and the reaction is promoted via the multiple attractive dispersion interactions
据报道,地球丰富的过渡金属铜催化环外 α,β-不饱和戊酮的不对称氢化,得到相应的手性环外烯丙基戊醇,收率高达 99%,ee(对映体过量)为 96%。机理研究表明,只有 C=O 键被化学选择性还原,并且通过 Cu 催化剂和底物之间的多重吸引分散相互作用促进反应。
Toward a Chemical Constructor: A Lego-Like Approach for Formal α-Alkylation of Cyclic Ketones
作者:Andriy I. Frolov、Yaroslav O. Chuchvera、Eugeniy N. Ostapchuk、Tetiana V. Druzhenko、Dmytro M. Volochnyuk、Serhiy V. Ryabukhin
DOI:10.1021/acs.joc.3c02628
日期:2024.6.7
generated in the α-position of various ketones viasynthesis of enaminone (step 1) and treatment with organomagnesium (step 2) with subsequent catalytic hydrogenation (step 3, 1° alkyl) or organocopperreagents (step 4, 2° alkyl). Tolerance toward ester, Boc-protected amine, and α-fluoro-substituted ketone moieties was demonstrated. The suitability of the method for late-stage natural product modification
ACYLSUFONAMIDE COMPOUNDS USEFUL AS EP3 RECEPTOR ANTAGONISTS
申请人:Janssen Pharmaceutica NV
公开号:US20210253562A1
公开(公告)日:2021-08-19
The present invention is directed to acylsulfonamide derivatives, pharmaceutical compositions containing them and their use as antagonists of the EP3 receptor, for the treatment of for example, impaired oral glucose tolerance, elevated fasting glucose, Type II Diabetes Mellitus, Syndrome X (also known as Metabolic Syndrome) and related disorders and complications thereof.