Site‐Specific C(sp<sup>3</sup>)–H Aminations of Imidates and Amidines Enabled by Covalently Tethered Distonic Radical Anions
作者:Rong Zhao、Kang Fu、Yuanding Fang、Jia Zhou、Lei Shi
DOI:10.1002/anie.202008806
日期:2020.11.9
utilization of N‐centered radicals to synthesize nitrogen‐containing compounds has attracted considerable attention recently, due to their powerful reactivities and the concomitant construction of C−N bonds. However, the generation and control of N‐centered radicals remain particularly challenging. We report a tethering strategy using SOMO‐HOMO‐converted distonic radical anions for the site‐specific
[EN] ENANTIOMERIC RESOLUTION METHOD<br/>[FR] PROCÉDÉ DE RÉSOLUTION ÉNANTIOMÉRIQUE
申请人:PULMAGEN THERAPEUTICS INFLAMMATION LTD
公开号:WO2011015868A1
公开(公告)日:2011-02-10
A method for the preparation of pioglitazone O,O'-dibenzoyl-L-tartrate wherein the content by weight of pioglitazone consists of at least 95 % by weight of the 5R enantiomer and less than 5 % of the 5S enantiomer, which method comprises: (1a) adding seed crystals of 5R- pioglitazone O,O'-dibenzoyl-l-tartrate to a rnethanol-water solution of racemic pioglitazone hydrochloride and O,O'-dibenzoyI-L-tartaric acid, thereby precipitating pioglitazone O,O'- dibenzoyl-L-tartrate;(1b) recovering said precipitate from step (1a); (1c) forming a solution of the precipitate from step (1b) in a solvent mixture of methanol, acid and water and mixing into to the resultant solution seed crystals of 5R-pioglitazone O,O'-dibenzoyl-L-tartrate, thereby precipitating pioglitazone O,O'-dibenzoyl-L-tartrate; (1d) recovering said precipitate from step (1c); (1e) repeating steps (1c) and (1d), the recovered product being the desired pioglitazone O,O'-dibenzoy! tartrate wherein the content by weight of pioglitazone consists of at least 95 % by weight of the 5R enantiomer and less than 5 % of the 5S enantiomer. Also disclosed is a modification of the method in which step 1(e) is omitted.
[EN] 5R- 5 -DEUTERATED GLITAZONES FOR RESPIRATORY DISEASE TREATMENT<br/>[FR] GLITAZONES 5R-5-DEUTÉRÉS POUR LE TRAITEMENT DE MALADIES RESPIRATOIRES
申请人:PULMAGEN THERAPEUTICS INFLAMMATION LTD
公开号:WO2010150014A1
公开(公告)日:2010-12-29
A composition comprising a 5R-5-deuterated glitazone or a salt thereof, in which composition the 5R-5 deuterated glitazone component includes less than 5% by weight in total of 5R-5-protonated glitazone, 5S-5-protonated glitazone and 5S-5- deuterated glitazone. The glitazone may be rosiglitazone or pioglitazone. Compositions may be for pulmonary inhalation for treatment of Pulmonary inflammatory disease.
Synthesis and application of new chiral ligands for the asymmetric borane reduction of prochiral ketones
作者:Ron Hulst、Hero Heres、Nathalie C.M.W. Peper、Richard M. Kellogg
DOI:10.1016/0957-4166(96)00154-1
日期:1996.5
Two chiral nonracemic γ-amino alcohols, ephedrine thiol and the corresponding (thio)-phosphoramidates and (thio)-phosphinamides have been examined as catalysts for the reduction of propiophenone by various boranes. Up to 95% e.e. can be obtained with the phosphorus derivatives.
There is provided a pharmaceutical composition that is adapted for pulmonary administration by inhalation, which composition comprises a glitazone, such as pioglitazone or rosiglitazone, and one or more pharmaceutically acceptable carriers and/or excipients, and wherein the glitazone content of the composition consists of at least 95% by weight of the 5R enantiomer and less than 5% by weight of the 5S enantiomer. There is also provided a use and kit.