A novel concept that conversion of chiral 2-substituted DMAP into its DMAP-N-oxide could significantly enhance the catalytic activity and still be used as an acyltransfercatalyst is presented. A new type of chiral 2-substituted DMAP-N-oxides, derived from l-prolinamides, has been rationally designed, facilely synthesized, and applied in the dynamic kinetic resolution of azlactones. Using simple MeOH
pyridine nitrogen, which serves as the nucleophilic site in the asymmetric acyltransfer reaction, we discovered that chiral DMAP‐N‐oxides, in which the oxygen now acts as the nucleophilic site, are efficient acyltransfercatalysts. Our finding might open a new door for the development of chiral DMAP‐N‐oxides for asymmetric acyltransfer reactions.
The invention relates to compounds useful in treating conditions associated with voltage-gated ion channel function, particularly conditions associated with sodium channel activity. More specifically, the invention concerns compounds (e.g., compounds according to any of Formulas (I)-(XIII) and in particular Formula (X), and Compounds (1)-(236) of Table 1) that are useful in treatment of a variety of diseases and conditions.
Screening of simple N-aryl and N-heteroaryl pyrrolidine amide organocatalysts for the enantioselective aldol reaction of acetone with isatin
作者:Michael Kinsella、Patrick G. Duggan、Claire M. Lennon
DOI:10.1016/j.tetasy.2011.07.016
日期:2011.7
We have screened a range of simple N-aryl and N-heteroaryl pyrrolidine amide organocatalysts incorporating N-pyridyl and N-quinolinyl groups in the synthetically useful aldol reaction of isatin with acetone. The 'reverse amide' N-pyridyl pyrrolidinylmethyl amide catalysts proved highly catalytically active but gave disappointing enantioselectivities. However, an N-3-pyridyl prolinamide catalyst gave the aldol adduct in high yields and high enantioselectivity with up to 72% ee of the (S)-isomer. Conditions were optimised for this catalyst and in particular an additive screen identified a link between the pK(a) of the acid additive and the yield and enantioselectivity. An N-arylsulfonamide prolinamide was also identified as a catalyst for this reaction giving the (R)-enantiomer in 68% ee. (C) 2011 Elsevier Ltd. All rights reserved.
Benzimidazole Inhibitors of the Sodium Channel
申请人:DeGiacomo Mark G.
公开号:US20180111894A1
公开(公告)日:2018-04-26
The invention relates to compounds useful in treating conditions associated with voltage-gated ion channel function, particularly conditions associated with sodium channel activity. More specifically, the invention concerns compounds (e.g., compounds according to any of Formulas (I)-(XIII) and in particular Formula (X), and Compounds (1)-(236) of Table 1) that are useful in treatment of a variety of diseases and conditions.