Alkaline phosphatase inhibition by a series of pyrido[2,1-b]quinazolines: a possible relationship with cromolyn-like antiallergy activity
摘要:
Several known antiallergic agents, including cromolyn sodium and a series of pyrido[2,1-b]quinazolines, inhibit human alkaline phosphatase (ALP), a membranal enzyme associated with calcium uptake in certain tissues. A comparison of ALP and rat passive cutaneous anaphylaxis (PCA) inhibition indicates that PCA inhibition may be associated with drug-ALP interaction, since ALP inhibition potency parallels PCA inhibitory activity. The unpredictability of the PCA test toward clinical efficacy could in part be related to the uncompetitive nature of these inhibitors. The results also suggest that alkaline phosphatase may be a component of membranal calcium channels.
Alkaline phosphatase inhibition by a series of pyrido[2,1-b]quinazolines: a possible relationship with cromolyn-like antiallergy activity
摘要:
Several known antiallergic agents, including cromolyn sodium and a series of pyrido[2,1-b]quinazolines, inhibit human alkaline phosphatase (ALP), a membranal enzyme associated with calcium uptake in certain tissues. A comparison of ALP and rat passive cutaneous anaphylaxis (PCA) inhibition indicates that PCA inhibition may be associated with drug-ALP interaction, since ALP inhibition potency parallels PCA inhibitory activity. The unpredictability of the PCA test toward clinical efficacy could in part be related to the uncompetitive nature of these inhibitors. The results also suggest that alkaline phosphatase may be a component of membranal calcium channels.
Palladium‐Catalyzed Carbonylative Difunctionalization of C=N Bond of Azaarenes or Imines to Quinazolinones
作者:Xibing Zhou、Yongzheng Ding、Hanmin Huang
DOI:10.1002/asia.202000359
日期:2020.6.2
Supporting information for this article is given via a link at the end of the document. By intercepting the acylpalladium species with C=Nbond of azaarenes or imines other than free amines or alcohols, the difunctionalization of C=Nbond was established via palladium‐catalyzed carbonylation/nucleophilic addition sequence. This method is compatible with a diverse range of azaarenes and imines and allows
simple and efficientsynthesis of 11H-pyrido[2,1-b]quinazolin-11-ones by Cu(OAc)2·H2O-catalyzed reaction of easily available substituted isatins and 2-bromopyridine derivatives has been developed. The reaction involves C–N/C–C bond cleavage and two C–N bond formations in a one-pot operation. This methodology is complementary to previously reported synthetic procedures, and two plausible reaction mechanisms
AbstractAn efficient copper‐catalyzed tandem aerobic oxidative annulation and carbon‐carbon bond cleavage reaction was developed from easily accessible arylacetamides, which provides a direct approach for the domino synthesis of a vast array of tricyclic or tetracyclic fused quinazolinone alkaloid structures. A plausible reaction mechanism is proposed involving an aerobic benzylic oxidation/cyclization/decarbonylation cascade.magnified image
SCHWENDER, C. F.;SUNDAY, B. R.;DECKER, V. L., J. MED. CHEM., 1982, 25, N 6, 742-745