Glycopentanolones A-D, four new geranylated quinolone alkaloids from Glycosmis pentaphylla

Penicacids H–J, three new mycophenolic acid derivatives from the marine-derived fungus Rhizopus oryzae

“…2) exhibited an additional isoprenyl unit (5C) that extends the free side chain of penicacids. The congurations of double bonds at C-2 0 /C-3 0 and C-6 0 /C-7 0 were both determined to be E- conguration based on the carbon resonances olenic methyl groups at C-3 0 and C-7 0 that appeared at d C 16.5 and d C 16.1 ppm, respectively, rather than d C ¼ $23.0 ppm (expected for a Z-conguration) 33,34 along with comparison with reported literature. 13,30,31 The HMBC spectrum of 2 (Fig.…”

“…The third spin system is rather characteristic ranging from an anomeric proton at d 29 By searching the reported literature and comparing with NMR data obtained from 1, it was suggested that it is a related derivative to a class of fungal mycophenolic acid derivatives known as penicacids. 13,[30][31][32] The conguration of the C-2 0 /C-3 0 double bond was determined to be E-conguration based on the carbon resonance of the olenic methyl group (Me-7 0 ) that resonated at d C ¼ 16.5 ppm conrming the E-conguration rather than d C ¼ $23.0 ppm (expected for a Z-conguration) 33,34 and by comparison with reported literature. 13,30,31 The HMBC spectrum of 1 (Fig.…”

Prediction of Natural Product Classes Using Machine Learning and 13C NMR Spectroscopic Data

“…With 8 NP classes, the total number of test cases is then 40. The refs − report new NP elucidation of families that we are interested in (see Tables S10–S17). Six different XGBoost models were tested on these cases: five models with the hyperparameters that achieved the highest f1-scores while training with the different resampling techniques and a model that employed a different input representation.…”

Recent Advances in One-Pot Modular Synthesis of 2-Quinolones

“…Targets on this scaffold, β-adrenergic receptors [2][3][4][5], muscarinic acetylcholine receptors [6][7][8], vascular endothelial growth factor receptors [9,10], poly [ADP-ribose] polymerase-1 [11][12][13][14][15], tyrosine-protein kinases [16], and serine/threonine-protein kinases [17][18][19], have been extensively studied for decades. In addition In addition, 2-quinolones are embedded as core structures in natural products [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. While a number of naturally occurring derivatives have been released, early reports revealed hybrid compounds that are derived from an isoprene unit and quinolones, namely hemiterpenoids [35,38- In addition, 2-quinolones are embedded as core structures in natural products [25][26][27][28][29][30][31]…”

“…In addition In addition, 2-quinolones are embedded as core structures in natural products [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. While a number of naturally occurring derivatives have been released, early reports revealed hybrid compounds that are derived from an isoprene unit and quinolones, namely hemiterpenoids [35,38- In addition, 2-quinolones are embedded as core structures in natural products [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. While a number of naturally occurring derivatives have been released, early reports revealed hybrid compounds that are derived from an isoprene unit and quinolones, namely hemiterpenoids [35,[38][39][40][41][42][43].…”