Synthesis of spiro[isobenzofuran-1(3H),4'-piperidines] as potential central nervous system agents. 1
作者:Victor J. Bauer、Brian J. Duffy、David Hoffman、Solomon S. Klioze、Raymond W. Kosley、Arthur R. McFadden、Lawrence L. Martin、Helen H. Ong、Harry M. Geyer
DOI:10.1021/jm00233a012
日期:1976.11
Synthesis of 1'-methyl-3-phenylspiro[isobenzofuran-1(3H),4'-piperidine] (7a, HP 365) and the demethyl analogue 9a (HP 505) was prompted by recognition of an aminoalkyl(aryl)isobenzofuran moiety common to the antidepressants talopram (Lu 3-010) and trans-10,11-dihydro-5,10-epoxy-5-[3-(methylamino)propyl]-5H-dibenzo[a,d]cyclohepten-11-ol (MK-940). Convenient laboratory synthesis of 7a was provided by
Cu
<sup>II</sup>
‐Catalyzed Asymmetric Hydrosilylation of Diaryl‐ and Aryl Heteroaryl Ketones: Application in the Enantioselective Synthesis of Orphenadrine and Neobenodine
作者:Yao‐Zong Sui、Xi‐Chang Zhang、Jun‐Wen Wu、Shijun Li、Ji‐Ning Zhou、Min Li、Wenjun Fang、Albert S. C. Chan、Jing Wu
DOI:10.1002/chem.201200379
日期:2012.6.11
With certain amounts of sodium tert‐butoxide and tert‐butanol as additives, catalytic amounts of an inexpensive and easy‐to‐handle copper source Cu(OAc)2⋅H2O, a commercially available and air‐stable non‐racemic dipyridylphosphine ligand, as well as the stoichiometric desirable hydride donor polymethylhydrosiloxane (PMHS), formed a versatile in situ catalyst system for the enantioselective reduction
Efficient palladium-catalyzed C(sp<sup>2</sup>)–H activation towards the synthesis of fluorenes
作者:Juan Song、Yali Li、Wei Sun、Chenglong Yi、Hao Wu、Haotian Wang、Keran Ding、Kang Xiao、Chao Liu
DOI:10.1039/c6nj02033j
日期:——
protocol for the synthesis of fluorene derivatives has been developed through palladium-catalyzed cyclization of 2′-halo-diarylmethanes via activation of arylic C–H bonds. The reactions occurred smoothly and allowed both electron-rich and electron-deficient substrates to convert into their corresponding fluorenes in good to excellent yields. Studies revealed that this Pd-catalyzedcyclization was also available
reductive cyclization of easily accessible benz-tethered 1,3-dienes containing a ketone moiety. This process provided biologically active 1,2-dihydronaphthalene-1-ol derivatives in good yields with excellent enantio- and diastereoselectivity. Mechanistic investigations using density functional theory revealed that (Z)- and (E)-allylcopper intermediates formed in situ from the diene and copper catalyst
Synthesis of Dibenzo[<i>b</i>,<i>f</i>]azepines via Palladium‐Catalyzed Cascade [4 + 3] Annulation of <i>o</i>‐Alkenyl Bromoarenes and <i>o</i>‐Bromoaniline Derivatives
A cascade [4+3] annulation of o-alkenyl bromoarenes and o-bromoaniline derivatives was described. Various dibenzo[b,f]azepines with substitutions on the 10/11 position were obtained in 14–97% yields. The synthetic versatility of this protocol is highlighted by the preparation of a precursor of the drug molecule oxcarbazepine, a gram-scale synthesis, and two product transformations. Unlike previous
描述了邻-烯基溴芳烃和邻-溴苯胺衍生物的级联[ 4+3]环化。获得了在 10/11 位点上有取代的各种二苯并[ b , f ]氮杂卓化合物,产率为 14-97%。该方案的合成多功能性通过药物分子奥卡西平前体的制备、克级合成和两种产品转化来突出。与之前的胺化/Heck 序列不同,该级联过程应该经历 C(乙烯基)、C(芳基)-钯环参与途径。