Highly Efficient and Scalable Synthesis of Clionamine D
摘要:
Herein we describe an efficient and scalable synthesis of clionamine D (4), a special member with autophagy bioactivity and an unprecedented spirobislactone side chain in the novel aminosteroid clionamines. This synthesis features a quick access to alpha-methylene-gamma-lactone 8 and a Mn(OAc)(3)-mediated radical [3 + 2] reaction to assemble the unique spirobislactone unit. Clionamine D (4) can also serve as a key synthetic precursor to other clionamine members.
Gram-Scale Synthesis of Tomatidine, a Steroid Alkaloid with Antibiotic Properties Against Persistent Forms of <i>Staphylococcus aureus</i>
作者:Chad Normandin、François Malouin、Eric Marsault
DOI:10.1002/ejoc.202000051
日期:2020.5.14
The first synthesis of the Solanum alkaloid tomatidine was achieved in 24.9 % (longest linear sequence) through addition of a chiral organolithium fragment to a protected dinorcholanic lactone derived from commercially available diosgenin. This approach enabled the multigram synthesis with the goal to support further studies of its antibiotic properties against persistent forms of Staphylococcus aureus