Syntheses of (<i>R</i>)- and (<i>S</i>)-2- and 6-Fluoronorepinephrine and (<i>R</i>)- and (<i>S</i>)-2- and 6-Fluoroepinephrine: Effect of Stereochemistry on Fluorine-Induced Adrenergic Selectivities
作者:Shou-fu Lu、B. Herbert、Günter Haufe、Klaus Wilhelm Laue、William L. Padgett、O. Oshunleti、John W. Daly、Kenneth L. Kirk
DOI:10.1021/jm990599h
日期:2000.4.1
Several routes to the enantiomers of fluoronorepinephrines (1) and fluoroepinephrines (2) were explored. A catalytic enantioselective oxazaborolidine reduction and a chiral (salen)Ti(IV) catalyzed asymmetric synthesis of silyl cyanohydrins proved efficacious in the key stereo-defining steps of two respective routes. Binding studies of the catecholamines with alpha(1)-, alpha(2)-, beta(1)-, and beta(2)-adrenergic
探索了氟去甲肾上腺素(1)和氟肾上腺素(2)对映异构体的几种途径。催化对映选择性恶唑硼烷还原和手性(salen)Ti(IV)催化的甲硅烷基氰醇的不对称合成在两条途径的关键立体定义步骤中被证明是有效的。儿茶酚胺与alpha(1)-,alpha(2)-,beta(1)-和beta(2)-肾上腺素受体的结合研究进行了审查。该测定证实氟取代对(R)-去甲肾上腺素和(R)-肾上腺素对肾上腺素能受体的亲和力有显着影响,这取决于取代的位置。因此,(R)-去甲肾上腺素和(R)-肾上腺素2位上的氟取代基降低了在alpha(1)-和alpha(2)-受体上的活性并增强了在beta(1)-和beta( 2)-受体,而在6位氟化会降低beta(1)-和beta(2)-受体的活性。氟取代对S-异构体的影响难以预测。