title: alpha-Methylene-gamma-butyrolactones: synthesis and vasorelaxing activity assay of coumarin, naphthalene, and quinoline derivatives.
abstract: Certain alpha-methylene-gamma-butyrolactone derivatives of coumarin, naphthalene, and quinoline were synthesized and evaluated for vasorelaxing effects on isolated rat thoracic aorta. The 7-[(2,3,4,5-tetrahydro-2-methyl-4-methylene-5-oxo-2-furanyl)methoxy]-2H- 1- benzopyran-2-ones, which have an aliphatic methyl substituent at the lactone C2, were more active than their C2-phenyl counterparts against high-K+ (80 mM) medium, Ca2+ (1.9 mM)-induced vasoconstriction and the norepinephrine (NE, 3 microM)-induced phasic and tonic constrictions (2a vs. 2b; 2c vs. 2d; 2e vs. 2f; 2g vs. 2h). Although 3-chloro-7-[(2,3,4,5-tetrahydro-2-methyl-4-methylene-5-oxo-2- furanyl)methoxy]-4-methyl-2H-1-benzopyran-2-one (2g) demonstrated the most potent inhibitory activities on the NE-induced phasic and tonic constrictions at concentrations of as low as 10 micrograms/ml, it possesses both affinity for NE-receptor and intrinsic activity to trigger the vasoconstriction. However, 8-[(2,3,4,5-tetrahydro-2-methyl-4-methylene-5-oxo-2- furanyl)methoxy]quinoline (10a) and other quinoline derivatives (11a, 12a) are pure irreversible non-competitive blockers of NE-receptor with no intrinsic activity. The aromatic ring played an important role in the vasorelaxing effects of alpha-methylene-gamma-butyrolactones; naphthalene was inactive, quinolines exhibited only affinity to the alpha-receptor, and coumarins possessed both affinity and intrinsic activity.
authors.affiliation: School of Chemistry, Kaohsiung Medical College, Taiwan, R.O.C.
authors.forename: Y L
authors.initials: YL
authors.lastname: Chen
authors.forename: T C
authors.initials: TC
authors.lastname: Wang
authors.forename: N C
authors.initials: NC
authors.lastname: Chang
authors.forename: Y L
authors.initials: YL
authors.lastname: Chang
authors.forename: C M
authors.initials: CM
authors.lastname: Teng
authors.forename: C C
authors.initials: CC
authors.lastname: Tzeng
mesh_terms: D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects; D003374:Coumarins / Q000737:chemistry*; D005260:Female; D008297:Male; D009281:Naphthalenes / Q000737:chemistry*; D010975:Platelet Aggregation Inhibitors / Q000138:chemical synthesis* / Q000494:pharmacology; D011804:Quinolines / Q000737:chemistry*; D051381:Rats; D017208:Rats, Wistar; D013329:Structure-Activity Relationship; D014664:Vasodilation / Q000187:drug effects; D014665:Vasodilator Agents / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D003374:Coumarins; D009281:Naphthalenes; D010975:Platelet Aggregation Inhibitors; D011804:Quinolines; D014665:Vasodilator Agents; C031721:naphthalene; C014096:alpha-methylene gamma-butyrolactone; C030123:coumarin; C037219:quinoline; D015107:4-Butyrolactone