New [11C]Phosgene Based Synthesis of [11C]Pyrimidines for Positron Emission Tomography
摘要:
Thymine, 5-FU, and uracil were successfully synthesized through a procedure involving a cyclocondensation of triphosgene with newly developed alpha-substituted beta-aminoacrylamides intermediates (1a, X = Me; 1b, X = F; 1c, X = H). The radioligands [2-C-11]thymine and [2-C-11]5-fluorouracil were synthesized in high radiochemical yields in 16-17 minutes from the end of bombardment by applying the cyclocondensation method with [C-11]COCl2,
limit! IsoGNA (a structural isomer of GNA) was found—in sharp contrast to GNA—to be highly restricted in its ability to base‐pair with itself and other nucleicacids. While homogeneous sequences (e.g. isoGNA(A)16) formed duplexes, the heterogeneous sequences showed no base‐pairing. This exemplifies the limitations of canonical nucleobases as the recognition elements in simpler, more primitive phosphate
Stereoselective Synthesis of 1′,2′-cis-Disubstituted Carbocyclic ribo-Nucleoside Analogues
作者:Chris Meier、Simon Weising、Ilaria Torquati
DOI:10.1055/s-0036-1591732
日期:2018.3
nucleobases or their precursors affords a series of ribo-configured carbocyclic 1′,2′-cis-disubstituted nucleoside analogues. Herein we disclose an efficient strategy for the convergent synthesis of 1′,2′-cis-disubstituted carbocyclic ribo-nucleoside analogues. Starting from an enantiomerically pure cyclopentenol precursor, the key step for the preparation of the highly functionalizedcarbocyclic building block
[EN] AGENTS THAT PREVENT OR REPAIR SKIN DAMAGE<br/>[FR] AGENTS PRÉVENANT OU RÉPARANT DES LÉSIONS CUTANÉES
申请人:UNIV MINNESOTA
公开号:WO2013106728A1
公开(公告)日:2013-07-18
The invention provides compounds of formula I: or a salt thereof as described herein. The invention also provides dermatological compositions comprising a compound of formula I or mixtures of one or more compounds of formula I, processes for preparing compounds of formula I, intermediates useful for preparing compounds of formula I and therapeutic methods for protecting skin or DNA from photodamage or repairing photodamaged skin or DNA.
[EN] SUNLESS TANNING COMPOUNDS AND COMPOSITIONS<br/>[FR] COMPOSÉS ET COMPOSITIONS DE BRONZAGE SANS SOLEIL
申请人:UNIV MINNESOTA
公开号:WO2015003095A1
公开(公告)日:2015-01-08
The invention provides sunless tanning compositions comprising a compounds of formula (I): or a salt thereof as described herein as well as methods for tanning mammalian skin by contacting the skin with the compounds of formula (I) or compositions comprising compounds of formula (I).
Positively-charged peptide nucleic acid analogs with improved properties
申请人:——
公开号:US20040034043A1
公开(公告)日:2004-02-19
The present invention relates to novel types of peptide nucleic acids (PNAS) with improved properties. In particular, it relates to positively charged PNA units having an ethylene linker between the backbone and the nucleobase, to oligonucleotide analogs comprising these units, to oligomers comprising these units, and to the use of positively charged PNAs as novel delivery agents with therapeutic and diagnostic applications including for antisense therapy.