Comparative action of carbocyclic thromboxane A2 stereoisomers on platelets
摘要:
Stereospecific requirements for the interaction of the thromboxane A(2) carbocyclic mimetic CTA(2), 1 with the human platelet PGH(2)/TXA(2) receptor have been explored. The two pairs of trans-1,2 and cis-3,4 side chain diastereoisomers were synthesised and evaluated for agonist and antagonist activity in human platelet rich plasma. Interestingly, the natural and unnatural trans diastereoisomers, both possessed potent aggregatory activity and equipotently inhibited platelet responses to subsequent addition of agonists, whereas, the respective unnatural cis isomers proved only weakly active or inert. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
Carbon-13 NMR spectra of methylated cyclobutanes and ethyl cyclobutane-carboxylates
作者:Ernest L. Eliel、K. Michal Pietrusiewicz
DOI:10.1002/mrc.1270130308
日期:1980.3
AbstractThe 13C NMR spectra of cyclobutane and seven methylated homologs and of ethyl cyclobutanecarboxylate and five isomeric diethyl cyclobutanedicarboxylates are reported and substituent parameters for methyl groups in methylcyclobutanes are calculated. Of note is a sizeable and nearly configuration‐independent upfield shifting γ‐effect.