l-1,2,3,4-Tetrahydro-8-methoxy-5-(methylthio)-2-naphthalenamine: a potent and selective agonist at .alpha.1-adrenoceptors
摘要:
1,2,3,4-Tetrahydro-8-methoxy-5-(methylthio)-2-naphthalenamine (SK&F-89748) has been resolved into d and l enantiomers and characterized pharmacologically. The more active isomer is the l, which has the S configuration as established by single-crystal X-ray diffraction studies. This compound is a potent and selective alpha 1-agonist with an EC50 in the isolated perfused rabbit ear artery of 9 +/- 2 nM. In several preparations, it has shown an alpha 1/alpha 2 selectivity ratio of over 100 and will be a useful tool for characterizing receptor subtypes.
The preparation of the (6R)- and (6S)-diastereoisomers of 5-formyltetrahydrofolate (leucovorin)
作者:Jonathan Owens、Lilias Rees、Colin J. Suckling、Hamish C. S. Wood
DOI:10.1039/p19930000871
日期:——
The separation of the (6R)- and (6S)-diastereoisomers of tetrahydrofolic acid by derivatisation on N-5 with chiral auxiliary reagents followed by fractional crystallisation or extraction is described. Chloroformates of chiral alcohols were used as chiral auxiliaries and those derived from cyclic terpene alcohols were found to be most effective for the separation. The cleavage of the derivative and conversion