(S)-(+)-4-Nitro-2-butanol (1) obtained by the stereoselective reduction of 4-nitro-2-butanone by bakers’ yeast was employed for the syntheses of natural products. A precursor of (+)-brefeldin A is synthesized starting from this chiral building block by 10 steps short-cut procedure compared with the shortest method so far reported. (S)-(+)-Sulcatol is obtained in much better enantiomeric purity than those reported. The reactivity of 1 in base-catalyzed condensations with Michael acceptors or aldehydes is largely affected by a base employed as the catalyst.
A Convenient Synthesis of (E)-Non-3-ene-2,5-dione, an Important Component Isolated from the Fire BeeTrigona tataira
作者:Roberto Ballini、Paola Astolfi
DOI:10.1002/jlac.199619961124
日期:1996.11
(E)-Non-3-ene-2,5-dione (5) the main componentisolatedfrom the volatile compounds derived from the cephalic secretion of workers of Trigona tataira, was conveniently prepared by nitroaldol reaction between pentanal 1 and 1-nitrobutan-3-ol (rac-2) catalyzed by Amberlyst A-21. The resulting β-nitro alcohol rac-3 was oxidized to the α-nitro ketones 4, which via elimination of nitrous acid (Et3N), afforded