66309-84-0Relevant academic research and scientific papers
Chemoselective and Site-Selective Reductions Catalyzed by a Supramolecular Host and a Pyridine-Borane Cofactor
Morimoto, Mariko,Cao, Wendy,Bergman, Robert G.,Raymond, Kenneth N.,Toste, F. Dean
supporting information, p. 2108 - 2114 (2021/02/06)
Supramolecular catalysts emulate the mechanism of enzymes to achieve large rate accelerations and precise selectivity under mild and aqueous conditions. While significant strides have been made in the supramolecular host-promoted synthesis of small molecules, applications of this reactivity to chemoselective and site-selective modification of complex biomolecules remain virtually unexplored. We report here a supramolecular system where coencapsulation of pyridine-borane with a variety of molecules including enones, ketones, aldehydes, oximes, hydrazones, and imines effects efficient reductions under basic aqueous conditions. Upon subjecting unprotected lysine to the host-mediated reductive amination conditions, we observed excellent ?-selectivity, indicating that differential guest binding within the same molecule is possible without sacrificing reactivity. Inspired by the post-translational modification of complex biomolecules by enzymatic systems, we then applied this supramolecular reaction to the site-selective labeling of a single lysine residue in an 11-amino acid peptide chain and human insulin.
Absolute configuration of nafuredin, a new specific NADH-fumarate reductase inhibitor
Takano, Daisuke,Nagamitsu, Tohru,Ui, Hideaki,Shiomi, Kazuro,Yamaguchi, Yuuichi,Masuma, Rokuro,Kuwajima, Isao,Mura, Satoshi
, p. 3017 - 3020 (2007/10/03)
Nafuredin, a new specific NADH-fumarate reductase inhibitor, was isolated from the culture broth of a fungal strain Aspergillus niger FT-0554. The stereoselective synthesis of three degradation products obtained by ozonolysis of nafuredin allowed elucidation of the absolute configuration of nafuredin.
