Enantio- and Diastereoselective Synthesis of 1,5-<i>syn</i>-(<i>Z</i>)-Amino Alcohols via Imine Double Allylboration: Synthesis of <i>trans</i>-1,2,3,6-Tetrahydropyridines and Total Synthesis of Andrachcine
作者:Christophe Allais、William R. Roush
DOI:10.1021/acs.orglett.7b00995
日期:2017.5.19
A stereoselective synthesis of trans-1,2,3,6-tetrahydropyridines 8 is described. This synthesis proceeds via intramolecular Mistunobu reactions of 1,5-syn-(Z)-amino alcohols 7, which were prepared by a highly diastereo- and enantioselective double-allylboration reaction of aldehyde 5 and silylimine 6. The chiral bifunctional γ-borylallylborane 9E was generated in situ by hydroboration of allene 3 with
Synthesis and Biological Evaluation of Dichlorinated Chondramide Derivatives
作者:Dominic Becker、Uli Kazmaier
DOI:10.1002/ejoc.201500369
日期:2015.7
Straightforward synthetic protocols for the synthesis of new ethyl-substituted dichlorinatedchondramides with different methyl-substitution patterns in the polyketide fragment have been developed. The methyl groups at the ϵ-position can be removed completely without a significant influence on the biological activity. In contrast, after removal of the α-methyl group, a significant drop in activity
The present invention relates to N-phenyl-1-(4-pyridinyl)-1H-pyrazol-3-amine derivatives and pharmaceutically acceptable salts thereof, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, according to formula (I): wherein R1, R2, R3, R4, R5, R6 have the meaning defined in the claims. The invention particularly relates to positive allosteric modulators of nicotinic acetylcholine receptors, such positive allosteric modulator having the capability to increase the efficacy of nicotinic receptor agonists.
The present invention relates to N-phenyl-1-(4-pyridinyl)-1H-pyrazol-3-amine derivatives and pharmaceutically acceptable salts thereof, processes for preparing them, pharmaceutical compositions containing them and their use in therapy, according to formula (I)
Wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
have the meaning defined in the claims.
The invention particularly relates to positive allosteric modulators of nicotinic acetylcholine receptors, such positive allosteric modulator having the capability to increase the efficacy of nicotinic receptor agonists.
The thermal intramolecular Diels–Alder cycloaddition of a 2 : 1 mixture of ethyl (2E,8E and Z, 10E,13R)-13-(t-butyldimethylsilyl) oxy-2,10-dimethyl-2,8,10-pentadecatrienoate provided four diastereomeric cycloadducts. Deprotection of one of the cycloadducts provided PI-201, a novel platelet aggregation inhibitor, as its natural form. Three stereoisomers of PI-201 were prepared from the other cycloadducts