Molecules 2019, 24, 3185
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1H-NMR (600 MHz) (CDCl3)
δ
(ppm): 6.54 (dd, 1H, J = 3.4, 1.8 Hz, H-3”), 6.77 (d, 1H, J = 3.4 Hz,
H-4”), 6.93 (ddd, 1H, J = 8.2, 7.2, 1.1 Hz, H-5’), 7.02 (dd, 1H, J = 8.4, 0.9 Hz, H-3’), 7.49 (ddd, 1H, J = 8.6,
7.2, 1.6 Hz, H-4’), 7.55 (d, 1H, J = 15.1 Hz, H-2), 7.56 (d, 1H, J = 1.4 Hz, H-5”), 7.68 (d, 1H, J = 15.2 Hz,
H-3), 7.92 (dd, 1H, J = 8.1, 1.6 Hz, H-6’), 12.89 (s, 1H, -OH).
13C-NMR (151 MHz, CDCl3)
δ = 113.03 (C-4”), 117.29 (C-3”), 117.73 (C-2), 118.66 (C-3’), 118.98
(C-5’), 120.17 (C-1’), 129.77 (C-6’), 131.26 (C-3), 136.44 (C-4’), 145.55 (C-5”), 151.65 (C-2”), 163.66 (C-2’),
193.46 (C-1).
The resulting compound (3) was characterized by the following NMR spectral data:
1H-NMR (600 MHz) (CDCl3)
δ (ppm): 6.95 (ddd, 1H, J = 8.1, 7.1, 1.1 Hz, H-5’), 7.02 (dd, 1H, J = 8.4,
1.2 Hz, H-3’), 7.12 (ddd, 1H, J = J = 5.0, 3.7, 0,3 Hz, H-4”), 7.41 (d, 1H, J = 3.6, Hz, H-3”), 7.44 (d, 1H,
J = 15.2 Hz, H-2), 7.47 (d, 1H, J = 4.9 Hz, H-5”), 7.49 (ddd, 1H, J = 8.4, 7.2, 1.5 Hz, H-4’), 7.89 (dd, 1H,
J = 8.1, 1.6 Hz, H-6’), 8.05 (dd, 1H, J = 15.2, 0,5 Hz, H-3), 12.85 (s, 1H, -OH).
13C-NMR (151 MHz, CDCl3)
δ (ppm) = 118.74 (C-3’), 118.95 (C-2), 118.99 (C-5’), 120.06 (C-1’),
128.66 (C-4”), 129.65 (C-6’), 129.68 (C-5”), 132.89 (C-3”), 136.49 (C-4’), 138.00 (C-3), 140.30 (C-2”),
163.69 (C-2’), 193.27 (C-1).
3.2. Microorganisms
The studies were carried out on eight strains of yeasts of the species Rhodotorula rubra (KCh 4
and KCh 82), Rhodotorula marina (KCh 77), Rhodotorula glutinis (KCh 242), Yarrowia lipolytica (KCh
71), Candida viswanathii (KCh 120), Saccharomyces cerevisiae (KCh 464), and Candida parapsilosis (KCh
909), which have already been described [26,33], and come from the collection of the Department of
Chemistry of Wrocław University of Environmental and Life Sciences, Poland. All the strains were
cultivated on a Sabouraud agar consisting of aminobac (5 g), glucose (40 g) and agar (15 g) dissolved
in 1 L of distilled water and pH 5.5 and stored in a fridge at 4 ◦C.
3.3. Analysis
Initial tests were carried out using TLC plates (SiO2, DC Alufolien Kieselgel 60 F254 (0.2 mm thick),
Merck, Darmstadt, Germany). The product separation on a plate in cyclohexane is Ethyl acetate eluent
(9:1 v/v). The product was observed (without additional visualization) under the UV lamp for the
wavelength of 254 nm.
3.4. Gas Chromatography (GC)
GC analysis were performed using an Agilent 7890A gas chromatograph, equipped with
a flame ionization detector (FID) (Agilent, Santa Clara, CA, USA). The capillary column DB-5HT
(
30 m × 0.25 mm × 0.10 µm) was used to determine the composition of the product mixtures.
A temperature program was applied as follows: 80–300 ◦C, the temperature on the detector: 300 ◦C,
injection 1 l, flow 1 mL/min, flow H2: 35 mL/min, air flow; 300 mL/min, time of analysis; 18.67 min.
The retention time of the substrate —9,6 min, product retention time—8,5 min. The retention times
and were recorded as 10,8 min, and 9,7 min,
µ
1
2
for compounds having the thiophene substituent
respectively (Supplementary Materials).
3
4
3.5. NMR Analysis
NMR analysis was performed using a DRX 600 MHz Bruker spectrometer (Bruker, Billerica,
MA, USA). The prepared samples were dissolved in deuterated chloroform CDCL3. The analyses
performed, included 1H-NMR, 13C-NMR, HMBC (two-dimensional analysis) HMQC (heteronuclear
correlation) and COSY (correlation spectroscopy) (Supplementary Materials).