Studies on the synthesis and anti-Osteoporosis of estrogen-GHRPs linkers
摘要:
The linkers of estrogen-GHRPs were prepared by the combination of estradiol, estrone, TyrGlyGlyPheLeuOH, and TyrGlyGlyPheLeuOH. Their anti-osteoporosis effect was evaluated by analyzing the data, for instance the weight of the body, femur, femur ash, the content of calcium and phosphor in the femur, the content of calcium and ALP activity in the serum, obtained from the corresponding bioassay in vivo. The results indicated that the anti-osteoporosis potency for estradiol, estrone, TyrGlyGlyPheLeuOH and TyrGlyGlyPheLeuNH(2) may be totally enhanced each other via the corresponding linkers. (C) 2002 Elsevier Science Ltd. All rights reserved.
Peptide‐Catalyzed Fragment Couplings that Form Axially Chiral Non‐
<i>
C
<sub>2</sub>
</i>
‐Symmetric Biaryls
作者:Gavin Coombs、Marcus H. Sak、Scott J. Miller
DOI:10.1002/anie.201913563
日期:2020.2.10
We have demonstrated that small, modular, tetrameric peptides featuring the Lewis-basic residue β-dimethylaminoalanine (Dmaa) are capable of atroposelectively coupling naphthols and ester-bearing quinones to yield non-C2 -symmetric BINOL-type scaffolds with good yields and enantioselectivity. The study culminates in the asymmetric synthesis of backbone-substituted scaffolds similar to 3,3'-disubstituted
Optically pure diketopiperazines were obtained in good yields when dipeptide esters were refluxed in 2-butanol containing 0.1 M acetic acid for 3 hours. When prolyl-amino acid ester was used as the starting material, 1 to 2 M acetic acid was the most effective concentration.
Polymeric drug delivery conjugates and methods of making and using thereof
申请人:Pan Huaizhong
公开号:US09289510B2
公开(公告)日:2016-03-22
Described herein are biodegradable drug delivery conjugates for effectively delivering bioactive agents to a subject. The drug delivery conjugates comprise a water-soluble high molecular weight linear biodegradable polymer backbone comprising a plurality of linear water-soluble polymeric segments connected to one another by a first (main-chain) cleavable linker, wherein a bioactive agent is covalently bonded to at least one water-soluble polymeric segment, at least one cleavable linker, or a combination thereof. The conjugates possess numerous advantages over prior art delivery conjugates. Also described herein are methods for making and using the conjugates.
Oligopeptide der β-Carbolin-3-carbonsäure - Synthese und Affinität zu Benzodiazepinrezeptoren
作者:Klaus-Peter Lippke、Walter E. Müller、Walter Schunack
DOI:10.1002/ardp.19873200210
日期:——
Es wurden Oligopeptide der β‐Carbolin‐3‐carbonsäure dargestellt und deren Affinität zum Benzodiazepinrezeptor in Mäusehirn‐Membranen bestimmt. Über Struktur‐Affinitätsbeziehungen wird berichtet.
2-Benzoyl-2-ethoxycarbonylvinyl-1 and 2-benzoylamino-2-methoxy-carbonylvinyl-1 as<i>N</i>-protecting groups in peptide synthesis. Their application in the synthesis of dehydropeptide derivatives containing<i>N</i>-terminal 3-heteroarylamino-2,3-dehydroalanine
and 2-benzoylamino-2-methoxycarbonylvinyl groups in the peptide synthesis. Reactions of ethyl 2-benzoyl-3-dimethylaminopropenoate (6) with α-aminoacids gave N-(2-benzoyl-2-ethoxycarbonylvinyl-1)-α-amino acids 13–19. These were coupled with various amino acidesters to form N-(2-benzoyl-2-ethoxycar-bonylvinyl-1)-protected dipeptideesters 20–31. The removal of 2-benzoyl-2-ethoxycarbonylvinyl-1 group