New Crown Spirobenzopyrans as Light- and Ion-Responsive Dual-Mode Signal Transducers
摘要:
A new class of crown spirobenzopyrans were designed and synthesized. The crown spirobenzopyrans showed thermally irreversible photochromism only in the presence of alkali-metal cations accompanying cation-selective coloring efficiency. Thus, the new crown spirobenzopyrans could transmit information of two different simultaneous stimuli (ion and photon) to changes in their optical properties. The dual-mode signal transducer molecules developed here can be considered to perform ''AND'' gate type signal transduction based on photochromism of artificial receptors. Molecular recognition abilities and photochromic properties of the new crown spirobenzopyrans were characterized by use of NMR and FAB mass spectroscopies.
Intramolecular Larock Indole Synthesis: Preparation of 3,4-Fused Tricyclic Indoles and Total Synthesis of Fargesine
作者:Dong Shan、Yan Gao、Yanxing Jia
DOI:10.1002/anie.201300571
日期:2013.4.26
Core strength: A new and general strategy for the construction of 3,4‐fused tricyclic indoles, which are the core structure of numerous natural products and bioactive molecules, has been developed. The method involves a one‐step intramolecular Larock indolization and was successfully applied to the first total synthesis of fargesine.
Short syntheses of the tricyclic indole alkaloids cimitrypazepine and fargesine
作者:Ganesh Ghimire、Björn C.G. Söderberg
DOI:10.1016/j.tetlet.2016.07.061
日期:2016.8
A short synthetic sequence leading to the tricyclic alkaloids cimitrypazepine and fargesine is reported. An intramolecular Heck reaction and a palladium catalyzed reductive N-heterocyclization are key steps in the synthesis.
Transmission of recognition information to other sites in a molecule: proximity of two remote sites in the spirobenzopyran by recognition of alkali-metal cations
作者:Masahiko Inouye、Masaru Ueno、Teijiro Kitao
DOI:10.1021/jo00032a005
日期:1992.3
A new spirobenzopyran was synthesized, in which recognition of alkali-metal cations induced a structural change in the molecule accompanying coloration that resulted in a proximity of two remote sites in the molecule.
NOVEL 5-IODO-6-AMINO-1,2-BENZOPYRONES AND THEIR ANALOGS USEFUL AS CYTOSTATIC AND ANTIVIRAL AGENTS