Synthesis and pharmacological investigation of novel 2-aminothiazole-privileged aporphines.
A series of apomorphine ((-)-1, APO)-derived analogues ((+/-)-3, (-)-4-(-)-6) were designed and synthesized by hybridizing APO with a privileged 2-aminothiazole functionality which was lent from the orally available anti-parkinsonian drug, pramipexole (2). Among these hybridized compounds, catecholic aporphine (-)-6 shows good affinity at the D(2) receptor with K(i) of 328nM, slightly less potent (3-fold), but more selective against the D(1) receptor than that of the parent compound, APO. Although possessing reduced affinity at the D(2) receptor, aporphines 15 and 18 show significant potency at both the D(1) and 5-HT(1A) receptors. The former compound is equipotent at both receptors (K(i): 116 and 151nM, respectively), while the latter is 8-fold more potent at the D(1) (K(i): 78nM) than at the 5-HT(1A) receptors (K(i): 640nM). These results indicate that the catechol fragment is critical for the D(2) receptor binding of the anti-parkinsonian drug, APO ((-)-1), but not necessary for binding at the D(1) and 5-HT(1A) receptors.
Synthetic Organic & Medicinal Chemistry Laboratory (SOMCL), Shanghai Institute of Materia Medica (SIMM), Chinese Academy of Sciences, Building 3, Room 426, 555 Zuchongzhi Road, Pudong, Shanghai 201203, China.
Zhili
Z
Liu
Xuetao
X
Chen
Leiping
L
Yu
Xuechu
X
Zhen
Ao
A
Zhang
D000818:Animals; D000978:Antiparkinson Agents; D001060:Aporphines / Q000138:chemical synthesis* / Q000378:metabolism; D006801:Humans; D011485:Protein Binding; D051381:Rats; D044282:Receptor, Serotonin, 5-HT1A / Q000378:metabolism*; D017447:Receptors, Dopamine D1 / Q000819:agonists / Q000378:metabolism*; D017448:Receptors, Dopamine D2 / Q000819:agonists / Q000378:metabolism*; D058825:Serotonin 5-HT1 Receptor Agonists; D013329:Structure-Activity Relationship; D013844:Thiazoles / Q000138:chemical synthesis* / Q000378:metabolism
D000978:Antiparkinson Agents; D001060:Aporphines; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2; D058825:Serotonin 5-HT1 Receptor Agonists; D013844:Thiazoles; D044282:Receptor, Serotonin, 5-HT1A; C004483:2-aminothiazole