Antiproliferative Hybrid Analogs of the Hormone 1α,25-Dihydroxyvitamin D<sub>3</sub>: Design, Synthesis, and Preliminary Biological Evaluation
作者:Gary H. Posner、Jae Kyoo Lee、M. Christina White、Richard H. Hutchings、Haiyan Dai、Joseph L. Kachinski、Patrick Dolan、Thomas W. Kensler
DOI:10.1021/jo970049w
日期:1997.5.1
dichloride promotes highly regioselective and stereoselective Diels-Alder cycloaddition between 3-bromo-2-pyrone, prepared in a new way, and unactivated terminal alkene 4-(tert-butyldimethylsiloxy)-1-butene. The conjugate base of A-ring allylic phosphine oxide 20 adds chemospecifically to the C-8 keto group of some C-8,C-24-diketones to form directly metabolically resistant 24-oxo analogs of 1alpha,25-dihydroxyvitamin
10-12 kbar压力与Lewis酸性二氯化锌的结合促进了以新方法制备的3-溴-2-吡喃酮与未活化的末端烯烃4-(叔丁基二甲基甲硅烷氧基)-1之间的高度区域选择性和立体选择性Diels-Alder环加成反应-丁烯。A环烯丙基氧化膦20的共轭碱将化学特异性地添加到某些C-8,C-24-二酮的C-8酮基上,从而直接形成1alpha,25-dihydroxyvitamin D(3)的具有抗新陈代谢作用的24-oxo类似物。 (骨化三醇)。这些新的杂合类似物中的几种在体外抑制钙质细胞生长的作用与钙三醇一样,即使在生理上相关的10-100纳摩尔浓度下也是如此。