On The Protection of 3α-Hydroxy Group of A/B<i>cis</i>Steroids
作者:Sharmila Banerjee Mukhopadhyay、Umesh R. Desai、Girish K. Trivedi
DOI:10.1080/00397919108019755
日期:1991.3
The difficulties encountered in the protection of 3-alpha-hydroxy group of lithocholic acid 1 with three different types of protective groups are described. Only benzyl ether derivative was found to be suitable for synthetic transformations. The methodology for the synthesis of benzyl ethers of A/B cis steroids is reported for the first time.
2′(3α-Benzyloxy-24-norcholan-23-yl)-2′,4′4′-trimethyl-4′,5′-dihydrooxazoline-N-oxyl as a potential spin probe for model membranes
作者:S BANERJEE、G TRIVEDI、S SRIVASTAVA、R PHADKE
DOI:10.1016/0039-128x(94)90005-1
日期:1994.6
A new steroidal doxyl (4,4-dimethyloxazolidine-N-oxyl) nitroxide (SDN) viz. 2'-(3 alpha-benzyloxy-24-norcholan-2'-yl) -2',4',4'-trimethyl-4',5'-dihydrooxazoline-N-oxyl has been synthesized. This is expected to have higher mobility over other spin labels reported earlier. The localization of this spin probe in lipid bilayers has been determined using H-1 NMR and P-31 NMR techniques. The alterations induced by dugs in the membrane characteristics such as phase transition and permeability have been investigated using electron paramagnetic resonance (EPR) techniques. The results show the applicability of SDN as a potential spin probes in the study of biomembranes.
MOSBACH, E. H.;AYENGAR, NARAYAN, K. N.;MCSHERRY, C. K.
作者:MOSBACH, E. H.、AYENGAR, NARAYAN, K. N.、MCSHERRY, C. K.