Carbohydrate Carbocyclization by a Novel Zinc-Mediated Domino Reaction and Ring-Closing Olefin Metathesis
作者:Lene Hyldtoft、Robert Madsen
DOI:10.1021/ja001415n
日期:2000.9.1
is described using two consecutive organometallic transformations: a novel zinc-mediated domino reaction to give functionalized dienes followed by ring-closing olefin metathesis. In the first reaction, methyl ω-deoxy-ω-iodo glycosides undergo reductive elimination with zinc to produce a terminal double bond. This also liberates the aldehyde which is immediately alkylated in situ by various organozinc
Highly stereoselective and stereospecific syntheses of a variety of quercitols from d-(−)-quinic acid
作者:Tzenge-Lien Shih、Ya-Ling Lin、Wei-Shen Kuo
DOI:10.1016/j.tet.2004.11.084
日期:2005.2
The highly stereoselective synthesis of (−)-epi-, (−)-allo- and neo-quercitols as well as stereospecific synthesis of (−)-talo- and (+)-gala-quercitols have been achieved. The general strategy is employing dihydroxylation of the isolated double bond of various kinds of protected chiral (1,4,5)-cyclohex-2-ene-triols, which are derived from d-(−)-quinic acid. The choosing of protecting groups from either