2023年第4期广东化工第50卷总第486期www.gdchem.com·1·2-氯-4-异丙基氨基-5-(4,4,5,5-四甲基-1,3,2-二氧硼杂环戊烷-2-基)吡啶合成工艺研究董吉喆,段雨琳,万里晶,胡锦阳*(常州恒邦药业有限公司恒邦研究院,江苏常州213000)[摘要]氨基吡啶类化合物是一类重要的医药中间体,在众多药物中有广泛的应用。为了支持公司新药研发,本文开发了关键中间体C(2-氯-4-异丙基氨基-5-(4,4,5,5-四甲基-1,3,2-二氧硼杂环戊烷-2-基)吡啶)的高效合成路线。以5-溴-2,4-二氯吡啶作为起始原料,分别经过亲核芳香取代和钯催化硼酸酯化反应获得目标产品。第一步反应优化了投料比,温度,时间,可以有效避免二取代杂质。在优化Miyaura硼酸酯化反应过程中,使用公司高通量催化平台,筛选出醋酸钯/三苯基膦的催化体系组合,可以高效合成目标产物。通过简单的工艺参数优化,两步收率达到80.9%。本合成工艺具有反应干净,后处理简单,产品纯度好等优点。[关键词]氨基吡啶;亲核芳香取代;Miyaura硼酸酯化反应;钯催化;高通量[中图分类号]TQ[文献标识码]A[文章编号]1007-1865(2023)04-0001-04StudyontheSyntheticProcessof2-Chloro-4-isopropylamino-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolane-2-yl)PyridineDongJizhe,DuanYulin,WanLijing,HuJinyang*(HengbangResearchInstitute,ChangzhouHengbangPharmaceuticalCo.,Ltd.,Changzhou213000,China)Abstract:Aminopyridinecompoundsareaclassofimportantpharmaceuticalintermediates,whicharewidelyusedinmanydrugs.Inordertosupportthecompany'snewdrugdevelopment,anefficientsynthesisrouteofthekeyintermediateC(2-chloro-4-isopropylamino-5-(4,4,5,5-tetramethyl-1,3,2-dioxoboronheterocyclopentane-2-yl)pyridine)wasdeveloped.Using5-bromo-2,4-dichloropyridineasstartingmaterial,thetargetproductswereobtainedbynucleophilicaromaticsubstitutionandpalladiumcatalyzedboricacidesterification,respectively.Inthefirststep,thefeedingratio,temperatureandtimeareoptimized,whichcaneffectivelyavoiddissubstitutedimpurities.IntheoptimizationoftheMiyauraborateesterificationprocess,palladiumacetate/triphenylphosphinecatalyticsystemcombinationwasselectedusingthecompany'shigh-throughputcatalyticplatformforefficientsynthesisofthetargetproduct.Bysimpleoptimizationofprocessparameters,thet...