Diastereoselective epoxidation of olefins by organo sulfonic peracids, II
作者:R. Kluge、M. Schulz、S. Liebsch
DOI:10.1016/0040-4020(95)01128-5
日期:1996.2
have investigated the behaviour of sulfonic peracids 2in situ generated towards olefins 7a,7b,9,11,14,16,18, allylic and homoallylic alcohols 20,22,24,26,28,30,33 and α,β-unsaturated ketones 35,37,39. Generally, the epoxidation proceeds in a peracid-like manner with greater diastereoselectivity than those by common oxidants. In particular, the epoxidation of Δ4 3-ketosteroids 39a-i led to 4α,5α-epoxides
3α, 5α-Cyclo-6β, 19-oxidosteroid (II) was synthesized by the lead tetraacetate oxidation of 3α, 5α-cyclo-6β-hydroxysteroid (I) in benzene. The acid-catalysed solvolysis of the oxide (II) afforded 3α, 5α-cyclo-19-hydroxy-6β-substituted steroid (XVI) and/or Δ5-19-hydroxy-3β-substituted steroid (XVII), depending upon the reaction conditions employed. Oxidation of the oxide (II) with Jones reagent gave 3α, 5α-cyclo-6β, 19-dioxosteroid (XIX) with two equivalent molar oxidant, and 3α, 5α-cyclo-6-oxosteroid-19-oic acid (XX) with the excess reagent.
CARBOXYLIC ACID-TYPE LIPID, AND LIPID PARTICLE AND LIPID MEMBRANE EACH COMPRISING CARBOXYLIC ACID-TYPE LIPID
申请人:Toray Industries, Inc.
公开号:US20210387943A1
公开(公告)日:2021-12-16
A carboxylic acid-type lipid can accelerate adhesion or aggregation of platelets even if the carboxylic acid-type lipid does not carry a protein involved in adhesion or aggregation of platelets or a peptide corresponding to an active site of the protein; a lipid particle and a lipid membrane each include the carboxylic acid-type lipid; and a platelet aggregation accelerating agent, a platelet adhesion accelerating agent, a hemostatic agent and a platelet substitute each include the carboxylic acid-type lipid, the lipid particle or the lipid membrane. A carboxylic acid-type lipid is selected from carboxylic acid-type lipids represented by formulas (I) to (VI), a lipid particle includes the carboxylic acid-type lipid, a lipid membrane includes the carboxylic acid-type lipid, and a platelet aggregation accelerating agent, a platelet adhesion accelerating agent, a hemostatic agent and a platelet substitute each include the carboxylic acid-type lipid, the lipid particle or the lipid membrane.
Lipids and lipid assemblies comprising transfection enhancer elements
申请人:Panzner Steffen
公开号:US20080306153A1
公开(公告)日:2008-12-11
Lipid assemblies, such as liposomes, comprising transfection enhancer elements (TEE's), which are complexed with the lipid assemblies by means of ionic interactions, or lipids incorporating such TEE's are disclosed for enhancing the fusogenicity of the lipid assemblies. The TEE's have the formula:
hydrophobic moiety-pH sensitive hydrophilic moiety (II)
The pH sensitive hydrophilic moiety of each TEE is a weak acid having a pka of between 2 and 6 or a zwitterionic structure comprising a combination of acidic groups with weak bases having a pKa of between 3 and 8. Lipids incorporating one or more such TEEs have the formula (I):
Lipid moiety-[Hydrophobic moiety-pH sensitive hydrophilic moiety] (I)
[EN] ZWITTERIONIC LIPID NANOPARTICLE COMPOSITIONS, AND METHODS OF USE<br/>[FR] COMPOSITIONS DE NANOPARTICULES LIPIDIQUES ZWITTERIONIQUES ET PROCÉDÉS D'UTILISATION
申请人:UNIV CORNELL
公开号:WO2022140404A1
公开(公告)日:2022-06-30
A lipid nanoparticle composition comprising: (i) at least one zwitterionic polymer-containing lipid in which a lipid moiety is covalently attached to a zwitterionic polymer; (ii) at least one non-cationic lipid selected from charged and uncharged lipids, but not attached to a polymer; (iii) at least one cationic or ionizable lipid; and (iv) at least one therapeutic substance, and optionally (v) cholesterol or derivative thereof. Also described herein are methods of delivering a therapeutic substance to a subject, the method comprising administering to the subject a lipid nanoparticle composition described above.