钌钳络合物RuCl(CNNPh)(二膦)催化的黄烷酮和邻羟基查尔酮的转移氢化反应在温和的反应条件下和较短的反应时间下以80-88%的产率合成了邻羟基1,3-二丙醇( 1 h)在2-丙醇中的溶液。已发现助催化剂NaO i Pr的量对于将黄烷酮选择性还原为邻羟基1,3-二丙醇与黄烷-4-醇至关重要。初步结果表明,使用带有(S,R)-Josiphos的钳式催化剂,黄烷酮以中等转化率(36%)和高达92%ee还原为相应的(S)-醇。
Impact of mono- and disubstitution on the colorimetric dynamic covalent switching chalcone/flavanone scaffold
作者:Brian M. Muller、Jesse Mai、Reid A. Yocum、Marc J. Adler
DOI:10.1039/c4ob00398e
日期:——
The impact of substitution on a novel colorimetric dynamic covalent switching scaffold was investigated using UV/Vis and NMR spectroscopy.
通过紫外/可见光谱和核磁共振谱,研究了替代对一种新型比色动态共价开关支架的影响。
Rhodium/Chiral Diene-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to Chromones: A Highly Enantioselective Pathway for Accessing Chiral Flavanones
作者:Qijie He、Chau Ming So、Zhaoxiang Bian、Tamio Hayashi、Jun Wang
DOI:10.1002/asia.201403290
日期:2015.3
Chromone has been noted to be one of the most challenging substrates in the asymmetric 1,4‐addition of α,β‐unsaturated carbonyl compounds. By employing the rhodium complex associated with a chiral diene ligand, (R,R)‐Ph‐bod*, the 1,4‐addition of a variety of arylboronicacids was realized to give high yields of the corresponding flavanones with excellent enantioselectivities (≥97 % ee, 99 % ee for
Synthetic approach to flavanones and flavones via ligand-free palladium(ii)-catalyzed conjugate addition of arylboronic acids to chromones
作者:Donghee Kim、Kyungrok Ham、Sungwoo Hong
DOI:10.1039/c2ob26061a
日期:——
The remarkable catalytic effects of Fe(OTf)3 in the context of the Pd(II)-catalyzed conjugate addition of arylboronic acids to chromones were observed to yield a variety of flavanones under mild conditions. The addition of catalytic amounts of DDQ and KNO2 to the reactions exclusively yielded flavone analogs. The reaction scope for the transformation was fairly broad, affording good yields of a wide range of flavanones and flavones, which are privileged structures in many biologically active compounds.
Synthesis, Crystal Structure and Antitumour Activity Evaluation of 1<i>H</i>-thieno[2,3-<i>c</i>]chromen-4(2<i>H</i>)-one Derivatives
作者:Huchang Yu、Yan Li、Zhiyuan Feng、Hongwu Jiang、Yinglan Zhao、Youfu Luo、Wencai Huang、Zicheng Li
DOI:10.3184/174751917x14837116219573
日期:2017.1
diffraction analysis. A preliminary antitumour screening showed that 2-(2-fluorophenyl)-1H-thieno [2,3-c]chromen-4(2H)-one had moderate to good activity against A549, BGC-823, HCT116 and MDA-MB-453 cancer cell lines, and 2-(3,4-dimethoxyphenyl)-1H-thieno[2,3-c]chromen-4(2H)-one displayed similar activity against these four kinds of cancer cells compared with the reference drug.
Stereoselective reduction of flavanones by marine-derived fungi
作者:Iara L. de Matos、Willian G. Birolli、Darlisson de A. Santos、Marcia Nitschke、André Luiz M. Porto
DOI:10.1016/j.mcat.2021.111734
日期:2021.8
enantiomeric excesses (ee) of both cis- and trans-diastereoisomers (up to >99% ee). Ten strains were screened for reduction of flavanone 2a in liquid medium and in phosphate buffer solution. The most selective strains Cladosporium sp. CBMAI 1237 and Acremonium sp. CBMAI1676 were employed for reduction of flavanones 2a-g. The fungus Cladosporium sp. CBMAI 1237 presented yields of 72–87% with 0–64% ee cis and