Six New Vibralactone Derivatives from Cultures of the Fungus Boreostereum vibrans

Abstract

Phytochemical reinvestigation on the cultural broth of Boreostereum vibrans led to the isolation of six new vibralactone derivatives, vibralactone N (1), vibralactone O (2), vibralactone P (3), 10-lactyl vibralactone G (4), (3S*, 4R*)-6-acetoxymethyl-2,2-dimethyl-3,4-dihydro-2H-chromene-3,4-diol (5), vibralactone Q (6). Their structures were elucidated by extensive spectroscopic methods.Graphical Abstract.Electronic supplementary materialThe online version of this article (doi:10.1007/s13659-014-0029-z) contains supplementary material, which is available to authorized users.

Hydrogen bonding-promoted efficient Ru-catalyzed ring-closing metathesis of demanding homoallyl 2-(hydroxymethyl)acrylates

“…Diastereomer 1: [α] 25 D = +39.7 (c 3.12, CHCl 3 ). 1 H-NMR (500 MHz, CDCl 3 ) δ 7.34-7.09 (m, 10H), 6.92 (d,J = 6.5 Hz,1H),5.37 (d,J = 3.5 Hz,1H),4.49 (t,J = 6.0 Hz,1H),1H),2.74 (bs,1H),1H),1H),2H), 0.71 (d,J = 7.0 Hz,3H). 128.9,128.5,126.2,125.8,81.2,69.9,37.7,35.1,32.4,12.3.…”

Sterepinic Acids A–C, New Carboxylic Acids Produced by a Marine Alga-Derived Fungus

“…OUPS-124D-1 derived from the marine alga Undaria pinnatifida. 5 was reported by Liu et al, [9], and many studies then followed this work, isolating the derivatives of 5 including 6 [10][11][12][13][14][15]. We report the determination of the absolute configurations of 1-4 by applying the phenylglycine methyl ester (PGME) method [16].…”

Sterepinic Acids A–C, New Carboxylic Acids Produced by a Marine Alga-Derived Fungus

“…OUPS-124D-1 derived from the marine alga Undaria pinnatifida . 5 was reported by Liu et al [ 9 ], and many studies then followed this work, isolating the derivatives of 5 including 6 [ 10 , 11 , 12 , 13 , 14 , 15 ]. We report the determination of the absolute configurations of 1 – 4 by applying the phenylglycine methyl ester (PGME) method [ 16 ].…”