An enantioselective synthesis of the C(33)–C(37) fragment of Amphotericin B
作者:Kaisa Karisalmi、Kari Rissanen、Ari M. P. Koskinen
DOI:10.1039/b305845j
日期:——
An enantioselective synthesis of the C(33)-C(37) tripropionate fragment of AmphotericinB has been developed in only 6 steps.
对映选择性合成的两性霉素B的C(33)-C(37)三丙酸酯片段只有6个步骤。
4,5-BIS(ETHOXYCARBONYL)-[1,3]DIOXOLAN-2-YL AS A NEW ORTHOESTER-TYPE PROTECTING GROUP FOR THE 2′-HYDROXYL FUNCTION IN THE CHEMICAL SYNTHESIS OF RNA
作者:Boleslaw Karwowski、K. Seio、M. Sekine
DOI:10.1081/ncn-200061895
日期:2005.4.1
,3]dioxolan-2-yl as a newprotecting for the 2′-hydroxyl function. Our cyclic orthoester-type group is compatible with the DMTr strategy for oligonucleotide synthesis. This group was introduced to the 2′-hydroxylgroup of appropriately protected nucleoside derivatives in good yields under mild acidic conditions. Post-synthetic conversion of the moiety of this protectinggroup with an amine resulted
The enantiospecific synthesis of [(2′S, 3′S)-bis(hydroxymethyl)azetidin-1-yl]pyrimidine nucleosides 22, 25, and 27 was achieved via construction of the base on the 1-aminoazetidine 18 prepared from (+)-diethyl-L-tartrate, and they are the first members of a new class of nucleoside analogs in which the oxetane ring in oxetanocin-A 4 is replaced by an azetidine ring linked to a nucleic base through an
Chemical properties of 4,5-di(ethoxycarbonyl)-1,3-dioxolan-2-yl (DECDO) as a hydroxyl protecting group of the 2′-hydroxyl function in ribonucleosides
作者:Boleslaw Karwowski、Kohji Seio、Mitsuo Sekine
DOI:10.1002/jhet.5570440208
日期:2007.3
3-dioxolan-2-yl (DECDO) in view of its use as a protectinggroup for the 2′-hydroxyl function of ribonucleosides. The DECDO group is found to be compatible with the DMTr strategy for the currently-used oligonucleotide synthesis. Post-synthetic treatment with ammonia results in the conversion of this protectinggroup into the 4,5-dicarbamoyl-1,3-dioxolan-2-yl (DCBDO) group which is unexpectedly more stable in