Total Syntheses of (±)-Platencin and (−)-Platencin
作者:K. C. Nicolaou、G. Scott Tria、David J. Edmonds、Moumita Kar
DOI:10.1021/ja906801g
日期:2009.11.4
The secondary metabolites platensimycin and platencin, isolated from the bacterial strain Streptomyces platensis, represent a novel class of natural products exhibiting unique and potent antibacterial activity. Platencin, though structurally similar to platensimycin, has been found to operate through a slightly different mechanism of action involving the dual inhibition of lipid elongation enzymes
Asymmetric Epoxidation of α-Substituted Acroleins Catalyzed by Diphenylprolinol Silyl Ether
作者:Bojan P. Bondzic、Tatsuya Urushima、Hayato Ishikawa、Yujiro Hayashi
DOI:10.1021/ol102269s
日期:2010.12.3
Asymmetric epoxidation of α-substituted acroleins with hydrogen peroxide has been catalyzed by diphenylprolinol diphenylmethylsilyl ether to afford α-substituted-β,β-unsubstituted-α,β-epoxy aldehyde with excellent enantioselectivity and the generation of a chiral quaternary carbon center. The method was applied to a short synthesis of (R)-methyl palmoxirate.
Synthesis of a new versatile dienophile and its use in a highly diastereoselective Diels-Alder reaction
作者:Jean-Luc Renaud、Corinne Aubert、Max Malacria
DOI:10.1016/s0040-4039(99)00981-8
日期:1999.7
propargyl bromide, the preparation of 2-methylene-5-trimethylsilyl-pent-4-yn-1-ol was improved. This latter is the precursor of the corresponding aldehyde which was used for the first time as a dienophile in [4+2] reactions. The cycloadducts were obtained in very high yields and in a totally diastereoselective manner.