Syntheses of (−)-Funebrine and (−)-Funebral, Using Sequential Transesterification and Intramolecular Cycloaddition of a Chiral Nitrone
作者:Osamu Tamura、Nobutaka Iyama、Hiroyuki Ishibashi
DOI:10.1021/jo030257q
日期:2004.3.1
The first syntheses of (−)-funebrine [(−)-1] and (−)-funebral [(−)-2] are described. The syntheses feature sequential formation of nitrone VI frommethyl glyoxylate (5) with oxime 6, transesterification of nitrone VI with (E)-crotyl alcohol (4), and intramolecular cycloaddition of the resulting nitrone VII bearing crotyl ester to afford cycloadduct 7 as a major product. The adduct 7 was readily elaborated
In vitro anti-hyperglycemic activity of 4-hydroxyisoleucine derivatives
作者:Venkateswarlu Korthikunta、Jyotsana Pandey、Rohit Singh、Rohit Srivastava、Arvind K. Srivastava、Akhilesh K. Tamrakar、Narender Tadigoppula
DOI:10.1016/j.phymed.2014.09.007
日期:2015.1
The nonproteinogenic amino acid, 4-hydroxyisoleucine (1) has been isolated in large quantities from the fenugreek (T. foenurn-graecum) seeds. Few novel derivatives (3-11 and 13-18) were prepared from the naturally occurring 4-hydroxyisoleucine (1) and screened for their in vitro glucose uptake stimulatory effect in L-6 skeletal muscle cells. The derivatives 6, 7, 8, 10 and 11 exhibited better glucose uptake stimulatory activity than parent compound, 4-hydroxyisoleucine at 5 and 10 it M concentrations and compounds 7 and 11 enhanced translocation of insulin sensitive glucose transporters-4 in skeletal muscle cells. (C) 2015 Elsevier GmbH. All rights reserved.