Synthesis of Optically Active β,γ-Unsaturated α-Amino Acids and of α,β-Unsaturated γ-Amino Acids. SN2- vs. SN2’-Dichotomy of the Mitsunobu Amination of Allylic Alcohols
The paper describes the firsttotalsynthesis of natural varioxiranol A by chiral pool approach and confirmation of its absolute configuration by single-crystal X-ray analysis. The target varioxiranol A and its 4-epimer were obtained after 10 steps from single and available chiral source 1,2-O-isopropylidene-d-glyceraldehyde in an overall yield of 10% and 6%, respectively. A synthetic strategy based
A stereocontrolled synthetic route to the C1C18 subunit of pamamycin-607
作者:Sung Ho Kang、Joon Won Jeong
DOI:10.1016/s0040-4039(02)00655-x
日期:2002.5
The C1 C18 subunit 2 of the 16-membered macrodiolide pamamycin-607 has been synthesized stereo selectively using the Ag2CO3-mediated intramolecular iodoetherification for the two cis-2,5-disubstituted tetrahydrofurans, crotylation and cuprate epoxide opening for the hydroxyl and methyl substituents. (C) 2002 Elsevier Science Ltd. All rights reserved.