α‐ and β‐Lipomycin: Total Syntheses by Sequential Stille Couplings and Assignment of the Absolute Configuration of All Stereogenic Centers
作者:Max L. Hofferberth、Reinhard Brückner
DOI:10.1002/anie.201402255
日期:2014.7.7
structures of α‐lipomycin and its aglycon β‐lipomycin except for the configurations of their side‐chain stereocenters. We synthesized all relevant β‐lipomycin candidates: the (12R,13S) isomer has the same specific rotational value as the natural product. By the same criterion the (12R,13S)‐configured D‐digitoxide is identical to α‐lipomycin. We double‐checked our assignments by degrading α‐ and β‐lipomycin
Total Synthesis of the Trisaccharide Unit of the Molecular Chaperone Down-Regulator Versipelostatin
作者:Andreas Kirschning、Eike Kunst
DOI:10.1055/s-2006-942450
日期:——
The first synthesis of the trisaccharideunit of versipelostatin, a down regulator of grp78, was achieved, utilizing methyl triflate promoted glycosidations of thioethyl glycosyl donors of D-digitoxose and D-cymarose with protected digitoxal. The synthesis was terminated by the preparation of a thioglycoside based on diethyldithionophosphonic acid which is ready for further glycosidations with aglycons
Selective deprotection of benzyl (Bn) ethers in the presence of para-methoxybenzyl (PMB) ethers
作者:Xiaohua Li、Zachary Saleh、Brian Egri、Ali Hourani、Luke Harding、Kedar N. Baryal、Jianglong Zhu
DOI:10.1016/j.tetlet.2015.01.105
日期:2015.3
Substituted benzylethers have been widely used as readily manipulatable protecting groups for organic synthesis. It is known that electron-rich para-methoxybenzyl (PMB) ethers can be selectively deprotected over benzyl or other electron-poor benzylethers under oxidative conditions. In this presentation, we will describe an approach for selective deprotection of benzylethers in the presence of PMB