103 research outputs found
Syntheses of bilin chromophores toward the investigation of structure and function of phytochromes
We studied on the syntheses of linear tetrapyrrole (bilin) chromophores including the sterically locked derivatives toward the investigation of structure and function of phytochromes as photoreceptors. The synthesized chromophores were successfully assembled with bacterial and plant apophytochromes in vitro and/or in vivo to demonstrate that they are valuable tools for studies on phytochromes. © 2012 The Japan Institute of Heterocyclic Chemistry
Recent progress in a chiral multinucleating system utilizing tartaric acid esters
é沢倧åŠçå·¥ç 究åç©è³ªååŠç³»In order to develop a practical method for the construction of chiral molecules, we have designed a novel chiral reaction system possessing multi-metal centers utilizing tartaric acid ester as a chiral auxiliary. Based on this concept, we have developed an asymmetric 1,3-dipolar cycloaddition reaction of azomethine imines, an asymmetric hetero Diels-Alder reaction of nitroso compounds, an asymmetric Diels-Alder reaction of o-quinodimethanes. Furthermore, an asymmetric nucleophilic addition of alkynylzinc reagents, prepared in situ from dialkylzinc and 1-alkynes, to nitrones was achieved with high level of stereocontrol. In the last case, the addition of methylzinc salt of a product-like racemic hydroxylamine was found to be effective for unprecedented enhancement of enantioselectivity. © 2010 The Japan Chemical Journal Forum and Wiley Periodicals, Inc
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