Fluorination of 2-bromotetronic acid (7) in ethanol produces 2-bromo-3-ethoxy-2-fluoro-gamma-butyrolactone (8). Tributyltin hydride reduction of 8 gives 2-fluorotetronic acid in good yield.
Highly Efficient Formal [2+2+2] Strategy for the Rapid Construction of Polycyclic Spiroindolines: A Concise Synthesis of 11‐Demethoxy‐16‐
<i>epi</i>
‐myrtoidine
the stereoselective elaboration of polycyclic indole alkaloids is described. Upon treatment with the catalyst InCl3 (5 mol %), tryptamine‐derived enamides reacted readily with methylene malonate, thus enabling rapid and gram‐scale access to versatile tetracyclic spiroindolines with excellent diastereoselectivity (21 examples, up to 95 % yield, up to d.r.>95:5). This strategy provides a concise approach
An efficient palladium-catalyzed cross-coupling reaction of 4-hydroxy-pyrone or 4-hydroxy-2(5H)-furanone with arylboronic acid is described, which affords the 4-substituted-pyrones and 2(5H)-furanones in good yields. This transformation proceeds through a C-OH bond activation under mild conditions. (C) 2011 Elsevier Ltd. All rights reserved.
Preparation of O-methyl 3-acyl tetronic acids by the direct acylation of stannyl tetronates
作者:Steven V. Ley、David J. Wadsworth
DOI:10.1016/s0040-4039(00)95301-2
日期:1989.1
LEY, STEVEN V.;WADSWORTH, DAVID J., TETRAHEDRON LETT., 30,(1989) N, C. 1001-1004