作者:Marloes A. Wijdeven、Floris L. van Delft、Floris P.J.T. Rutjes
DOI:10.1016/j.tet.2010.05.089
日期:2010.7
The synthetic versatility of three chemoenzymatically prepared hydroxypiperidine building blocks has been explored, resulting in a library of enantiopure functionalized piperidines. Key steps involved N-acyliminium ion-mediated CC-bond formation and cross-metathesis reactions, after which full deprotection led to the set of free 3-hydroxypiperidines. (C) 2010 Elsevier Ltd. All rights reserved.
The first asymmetrictotalsynthesis of the unnatural enantiomer of cytotoxic awajanomycin (1) is reported. The synthetic approach features first a convergent strategy using the cross-olefin metathesis reaction to link the lipid side chain 2 and the piperidinone core structure 3. The second feature of the synthesis resides on the construction of segment 3 from the building block 5 via a three-component