Synthesis and chemosensing properties of cinnoline-containing poly(arylene ethynylene)s
作者:Natalia A Danilkina、Petr S Vlasov、Semen M Vodianik、Andrey A Kruchinin、Yuri G Vlasov、Irina A Balova
DOI:10.3762/bjoc.11.43
日期:——
Novel poly(aryleneethynylene)s comprising a cinnoline core were prepared in high yields via a three-step methodology. A Richter-type cyclization of 2-ethynyl- and 2-(buta-1,3-diynyl)aryltriazenes was used for cinnoline ring formation, followed by a Sonogashira coupling for the introduction of trimethylsilylethynyl moieties and a sila-Sonogashira coupling as the polycondensation technique. The fluorescence
Chemoselective Cobalt(I)-Catalyzed Cyclotrimerization of (Un)Symmetrical 1,3-Butadiynes for the Synthesis of 1,2,4-Regioisomers
作者:Sebastian M. Weber、Gerhard Hilt
DOI:10.1021/acs.orglett.9b01281
日期:2019.6.7
The cobalt(I)-catalyzed cyclotrimerization of (un)symmetrical 1,4-disubstituted 1,3-butadiynes is presented. In the case of unsymmetrical 1,3-butadiynes, this reaction can generate eight 1,2,4-substituted and four 1,3,5-substituted isomers. A single 1,2,4-substituted isomer was formed in excellent yields (up to 99%) and exclusive regioselectivities (>99:1) when symmetrical or a 1,3-butadiyne with an
Synthesis of Potentially Biologically Active 6-(1,3-Butadiynyl)purines
作者:M. Křováček、D. Dvořák
DOI:10.1002/jhet.1938
日期:2015.1
3‐Alkadiynyl(trimethyl)silanes were prepared by the Negishi or Sonogashira reactions of bromoethynyl(trimethyl)silane with several terminal alkynes in 34–75% yield. However, the direct Hiyama coupling of these compounds with 6‐iodopurine derivatives has not been successful. Therefore, a modified Sonogashira reactionusing TBAF or CsF for in situ removal of the trimethylsilyl group has been utilized
The [4 + 2] cross-benzannulation of conjugatedenynes and diynes under cobalt-catalysis led to 1,2,3-trisubstituted benzene derivatives in good yields. The reaction proceeds smoothly in absolute regiospecific control when symmetrical diynes are applied. Moreover, the use of unsymmetrical diynes was investigated, resulting in the formation of the unprecedented regioisomers as major products, which is
Towards Isocoumarin-Fused Enediyne Systems through the Electrophilic Cyclization of Methyl<i>o</i>-(Buta-1,3-diynyl)benzoates
作者:Natalia A. Danilkina、Larisa Y. Gurskaya、Aleksander V. Vasilyev、Irina A. Balova
DOI:10.1002/ejoc.201501262
日期:2016.2
synthesis of enediynes fused to an isocoumarin core was achieved through the electrophiliccyclization of o-(buta-1,3-diynyl)benzoates as a key step, followed by the Sonogashira coupling of the resulting 3-ethynyl-4-iodoisocoumarins with acetylenes. This approach allowed different substituents to be introduced to both ethynyl moieties with complete regiocontrol. The ability of the isocoumarin-fused enediynes