Metal-Free Allylic Oxidation of Steroids Using TBAI/TBHP Organocatalytic Protocol
作者:Ying-Pong Lam、Ying-Yeung Yeung
DOI:10.1002/asia.201800256
日期:2018.9.4
A mild, efficient and organocatalytic allylic oxidation of steroids using a TBAI/TBHP protocol has been developed. A range of bioactive Δ5‐en‐7‐ones can be easily prepared from the corresponding Δ5‐steroids. The methodology features several advantages, including readily available starting materials, environmentally benign oxidant, high functional group compatibility, and metal‐free catalysis.
Synthesis of diamino-furostan sapogenins and their use as scaffolds for positioning peptides in a preorganized form
作者:Daniel G. Rivera、Odette Concepción、Karell Pérez-Labrada、Francisco Coll
DOI:10.1016/j.tet.2008.03.023
日期:2008.5
The synthesis of peptide–furostane conjugates from natural steroidalsapogenins is reported. The approach comprises the introduction of α-oriented amino groups into spirostanic sapogenins followed by reductive opening of the spiroketal chain, thus producing diamino-furostanic scaffolds suitable for further functionalization. Solid and solution-phase coupling processes were utilized for the incorporation