Synthesis and Mixed Lineage Kinase Activity of Pyrrolocarbazole and Isoindolone Analogs of (+)K-252a
摘要:
Structural modification of the indolecarbazole natural product (+)K-252a identified structural requirements for MLK activity and a novel series of potent fused pyrrolocarbazole MLK1/3 inhibitors. The SAR revealed that the lactam regiochemistry, the shape of the heterocycle, and aryl rings B and F are important to MLK activity. Heteroatom and alkyl replacement of the N-12 and/or N-13 indole nitrogen atoms identified the nonplanar dihydronaphthyl[3,4-a]pyrrolo[3,4-c]carbazole-7-one (8) and corresponding 5,7-dione (7) as potent cell-permeable MLK1/3 family-selective leads with in vitro activity comparable to that of (+)K-252a and determined them to be 2- to 3-fold more potent than the aglycone natural product K-252c.
Syntheses of p-terphenyls and 11,12-dihydroindeno[2,1-a]fluorene by one-pot benzannulation of Diels–Alder reactions of trans-1,2-dichloroethene and dienes
p-terphenyls and 11,12-dihydroindeno[2,1-a]fluorene were successfully synthesized by one-pot benzannulation of Diels–Alderreaction with 1,2-dichloroethene as an acetyleneequivalent dienophile. Two chlorine atoms could be good leaving groups to easily undergo subsequent elimination reactions of Diels–Alder products at a high temperature.
通过Diels-Alder反应的一锅法苯并环合反应,以1,2-二氯乙烯作为乙炔当量的亲二烯体,成功地合成了一系列取代的对-三联苯和11,12-二氢茚并[ 2,1- a ]芴。两个氯原子可能是良好的离去基团,易于在高温下随后发生Diels–Alder产品的消除反应。
Joining the rings: the preparation of 2- and 3-indenyl-triptycenes, and curious related processes
作者:Kirill Nikitin、Helge Müller-Bunz、Yannick Ortin、Michael J. McGlinchey
DOI:10.1039/b703437g
日期:——
is accompanied by a novel palladium-catalysed carbocyclisation reaction leading to the indenophenanthrylene . The addition of benzyne to 9-(3-indenyl)anthracene, , yields the corresponding indenyltriptycene, , and, surprisingly, the anthracenyl methano-bridged phenanthrene . It has been demonstrated that 2-arylindenes can act as 1,3-dienes in the [4 + 2] cycloadditions of benzyne. The products , , and
Novel organoiron compounds resulting from the attempted syntheses of dibenzofulvalene complexes
作者:Brian R. Waldbaum、Robert C. Kerber
DOI:10.1016/s0020-1693(99)00123-1
日期:1999.8
2′-biindenyl with Fe(CO)5 generates (η4-2,2′-biindenyl)Fe(CO)3 and a ferrole isomer of (μ,η3:η3-dibenzo[b,e]fulvalene)Fe2(CO)6. Reaction of the dianion of dibenzo[b,e]fulvalene with ironcarbonyls produced a novel cyclized acyliron complex, whose structure was proven by X-ray crystallography; a mechanism is proposed for its formation. Reaction of the same dianion with (η5-cyclopentadienyl)Fe(CO)2Br generated
N‐(sulfonio)sulfilimine reagents: Non‐oxidizing Sources of Electrophilic Nitrogen Atom for Skeletal Editing
作者:Tobias Heilmann、Juan M Lopez-Soria、Johannes Ulbrich、Johannes Kircher、Zhen Li、Brigitte Worbs、Christopher Golz、Ricardo A Mata、Manuel Alcarazo
DOI:10.1002/anie.202403826
日期:——
Under rhodium catalysis N-sulfonio(sulfilimines) act as sulfonitrene precursors. Reaction of such species with indenes presumably delivers N-sulfonio aziridines, which evolve to isoquinolines via electrocyclic ring expansion. Contrarily, 1-arycyclobutenes are transformed into 1-cyano-1-arylcyclopropanes via ringcontraction.