TY  - JOUR
AU  - Trifunović, Snežana
AU  - Vajs, Vlatka
AU  - Macura, Slobodan
AU  - Juranić, Nenad
AU  - Djarmati, Z
AU  - Jankov, Ratko
AU  - Milosavljević, Slobodan
PY  - 1998
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2807
AB  - The isolation of two oxidation products of hyperforin from the aerial parts of Hypericum perforatum and their structure determination by means of 2D NMR methods is reported. The products had the same 1-(2-methyl-1- oxopropyl)-2,12-dioxo-3,10β-bis(3-methyl-2-butenyl)-11β-methyl-11α-(4- methyl-3-pentenyl)-5-oxatricyclo[6.3.1.0 4,8 ]-3-dodecene skeleton. In addition, one of them, with the same number of carbons as hyperforin (C 35 H 52 O 5 ), contained a 1-methyl-1-hydroxyethyl group in the 6β- position, whereas the other compound (a hemiacetal, C 32 H 46 O 5 ), presumably a degradation product of hyperforin, exhibited a 6-hydroxy function. The latter was an inseparable mixture of 6α- and 6β-hydroxy epimers undergoing (according to phase sensitive NOESY) mutual interconversion.
PB  - Elsevier
T2  - Phytochemistry
T1  - Oxidation products of hyperforin from Hypericum perforatum
VL  - 49
IS  - 5
SP  - 1305
EP  - 1310
DO  - 10.1016/S0031-9422(97)00903-5
ER  - 

@article{
author = "Trifunović, Snežana and Vajs, Vlatka and Macura, Slobodan and Juranić, Nenad and Djarmati, Z and Jankov, Ratko and Milosavljević, Slobodan",
year = "1998",
abstract = "The isolation of two oxidation products of hyperforin from the aerial parts of Hypericum perforatum and their structure determination by means of 2D NMR methods is reported. The products had the same 1-(2-methyl-1- oxopropyl)-2,12-dioxo-3,10β-bis(3-methyl-2-butenyl)-11β-methyl-11α-(4- methyl-3-pentenyl)-5-oxatricyclo[6.3.1.0 4,8 ]-3-dodecene skeleton. In addition, one of them, with the same number of carbons as hyperforin (C 35 H 52 O 5 ), contained a 1-methyl-1-hydroxyethyl group in the 6β- position, whereas the other compound (a hemiacetal, C 32 H 46 O 5 ), presumably a degradation product of hyperforin, exhibited a 6-hydroxy function. The latter was an inseparable mixture of 6α- and 6β-hydroxy epimers undergoing (according to phase sensitive NOESY) mutual interconversion.",
publisher = "Elsevier",
journal = "Phytochemistry",
title = "Oxidation products of hyperforin from Hypericum perforatum",
volume = "49",
number = "5",
pages = "1305-1310",
doi = "10.1016/S0031-9422(97)00903-5"
}

Trifunović, S., Vajs, V., Macura, S., Juranić, N., Djarmati, Z., Jankov, R.,& Milosavljević, S.. (1998). Oxidation products of hyperforin from Hypericum perforatum. in Phytochemistry
Elsevier., 49(5), 1305-1310.
https://doi.org/10.1016/S0031-9422(97)00903-5

Trifunović S, Vajs V, Macura S, Juranić N, Djarmati Z, Jankov R, Milosavljević S. Oxidation products of hyperforin from Hypericum perforatum. in Phytochemistry. 1998;49(5):1305-1310.
doi:10.1016/S0031-9422(97)00903-5 .

Trifunović, Snežana, Vajs, Vlatka, Macura, Slobodan, Juranić, Nenad, Djarmati, Z, Jankov, Ratko, Milosavljević, Slobodan, "Oxidation products of hyperforin from Hypericum perforatum" in Phytochemistry, 49, no. 5 (1998):1305-1310,
https://doi.org/10.1016/S0031-9422(97)00903-5 . .

TY  - JOUR
AU  - Stefanović, Milutin
AU  - Djarmati, Z
AU  - Gašić, Miroslav
PY  - 1970
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4664
AB  - One of the structural features of many bitter principles ls the presence of a &-lactone ring. Some of these compounds differ from one another by the state of oxidation of the molecule as a whole and also by the state of oxidation of the lactone ring (Le. chaparrin-glauca rubol) (1). However, the correlation of these compound by direct introduction of an oxygen function Into the lactone ring by chemical means represents a great difficulty.
PB  - Elsevier
T2  - Tetrahedron Letters
T1  - Acetoxylation of steroidal lactones by means of lead tetraacetate
VL  - 11
DO  - 10.1016/S0040-4039(01)98337-6
ER  - 

@article{
author = "Stefanović, Milutin and Djarmati, Z and Gašić, Miroslav",
year = "1970",
abstract = "One of the structural features of many bitter principles ls the presence of a &-lactone ring. Some of these compounds differ from one another by the state of oxidation of the molecule as a whole and also by the state of oxidation of the lactone ring (Le. chaparrin-glauca rubol) (1). However, the correlation of these compound by direct introduction of an oxygen function Into the lactone ring by chemical means represents a great difficulty.",
publisher = "Elsevier",
journal = "Tetrahedron Letters",
title = "Acetoxylation of steroidal lactones by means of lead tetraacetate",
volume = "11",
doi = "10.1016/S0040-4039(01)98337-6"
}

Stefanović, M., Djarmati, Z.,& Gašić, M.. (1970). Acetoxylation of steroidal lactones by means of lead tetraacetate. in Tetrahedron Letters
Elsevier., 11.
https://doi.org/10.1016/S0040-4039(01)98337-6

Stefanović M, Djarmati Z, Gašić M. Acetoxylation of steroidal lactones by means of lead tetraacetate. in Tetrahedron Letters. 1970;11.
doi:10.1016/S0040-4039(01)98337-6 .

Stefanović, Milutin, Djarmati, Z, Gašić, Miroslav, "Acetoxylation of steroidal lactones by means of lead tetraacetate" in Tetrahedron Letters, 11 (1970),
https://doi.org/10.1016/S0040-4039(01)98337-6 . .