122444-35-3Relevant articles and documents
POLYNUCLEOTIDE CONSTRUCTS HAVING DISULFIDE GROUPS
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, (2015/05/26)
The invention features polynucleotide constructs containing one or more components (i) containing a disulfide linkage, where each of the one or more components is attached to an internudeotide bridging group or a terminal group of the polynucleotide construct, and each of the one or more components (i) contains one or more bulky groups proximal to the disulfide group. The invention also features polynucleotide constructs containing one or more components (i) containing a disulfide linkage, where each of the one or more components (i) is attached to an internudeotide bridging group or a terminal group of the polynucleotide construct, and each of the one or more components (i) contains at least 4 atoms in a chain between the disulfide linkage and the phosphorus atom of the internudeotide bridging group or the terminal group; and where the chain does not contain a phosphate, an amide, an ester, or an alkenylene. The invention also features methods of delivering a polynucleotide to a cell using the polynucleotide constructs of the invention.
Organocatalytic asymmetric mannich cyclization of hydroxylactams with acetals: Total syntheses of ( )-epilupinine, ( )-tashiromine, and ( )-trachelanthamidine
Koley, Dipankar,Krishna, Yarkali,Srinivas, Kyatham,Khan, Afsar Ali,Kant, Ruchir
supporting information, p. 13196 - 13200 (2015/02/19)
An asymmetric, organocatalytic, one-pot Mannich cyclization between a hydroxylactam and acetal is described to provide fused, bicyclic alkaloids bearing a bridgehead N atom. Both aliphatic and aromatic substrates were used in this transformation to furnish chiral pyrrolizidinone, indolizidinone, and quinolizidinone derivatives in up to 89% yield and 97% ee. The total syntheses of (-)-epilupinine, (-)-tashiromine, and (-)-trachelanthamidine also achieved to demonstrate the generality of the process.
3,4-Dihydro-2H-1-benzopyran-2-carboxylic Acids and Related Compounds as Leukotriene Antagonists
Cohen, Noal,Weber, Giuseppe,Banner, Bruce L.,Lopresti, Rocco J.,Schaer, Beatrice,et al.
, p. 1842 - 1860 (2007/10/02)
Evaluation of a series of 3,4-dihydro-2H-1-benzopyran-2-carboxylic acids linked to the 2-hydroxyacetophenone pharmacophore present in the standard peptidoleukotriene antagonist FPL 55712 (1) has led to the discovery of Ro 23-3544 (7), an antagonist possessing greater potency and duration of action vs LTD4 than the standard (aerosol route of administration, guinea pig bronchoconstriction model).Interestingly, this compound also potently inhibited bronchoconstriction induced by LTB4 whereas 1 did not.Attempts to establish structure-activity relationships in this series involved modifications in the 2-hydroxyacetophenone moiety, the linking chain, and the chroman system.All variations produced analogues which were either inactive or possessed reduced potency relative to acid 7.Optical resolution of 7 was achieved by two methods.Absolute configurations of the enantiomers were determined via X-ray crystallographic analyses of an intermediate as well as a salt of the S enantiomer.Although the enantiommers exhibited similar potencies in in vitro assays and in vivo when administered intravenously, significant differences were observed in the guinea pig bronchoconstriction model vs LTC4 and LTD4 when administered by the aerosol route (S antipode 15-fold more potent).The properties of 7 have been compared with several recently reported leukotriene antagonists.