Novel tricyclic pyrazolopyrimidines as potent and selective GPR119 agonists
摘要:
Systematic SAR optimization of the GPR119 agonist lead 1, derived from an internal HTS campaign, led to compound 29. Compound 29 displays significantly improved in vitro activity and oral exposure, leading to GLP1 elevation in acutely dosed mice and reduced glucose excursion in an OGTT study in rats at doses >= 10 mg/kg. (C) 2014 Elsevier Ltd. All rights reserved.
Intramolecular nitrogen-hydrogen, oxygen-hydrogen and sulfur-hydrogen insertion reactions. Synthesis of heterocycles from .alpha.-diazo .beta.-keto esters
allows regio- and stereocontrolled access to a variety of functionalised and substituted seven-membered rings. The substitution array can be diastereoselectively modulated by appropriate choice of the reaction partners, and the reaction allows the control of up to five newly created stereocentres and a complete chiral induction in the case of an opticallyactive ketone precursor. The high level of
[reaction: see text] A versatile stereoselectivesynthesis of substituted and functionalized heterocyclic seven-memberedrings is described. The approach involves a formal two-carbon ring expansion of heterocyclic cyclopentanones through a base-induced anionic domino three-component transformation named the MARDicascade leading either to oxa-, aza-, or thiacycloheptanes bearing up to five contiguous