Chemoenzymatic synthesis of rengyoside -A, -B, isorengyoside and synthesis of their aglycones
摘要:
The chemoenzymatic synthesis of a group of naturally occurring cyclohexylethanoids, rengyoside-A, -B and isorengyoside, has been performed by enzymatic glucosidation of their chemically synthesized aglycones, rengyol, rengyoxide and isorengyol. (C) 1997 Published by Elsevier Science Ltd.
Protection of the Carbonyl Group as 1,2,4-Trioxane and Its Regeneration under Basic Conditions<sup>1</sup>
作者:Chandan Singh、Heetika Malik
DOI:10.1021/ol052378d
日期:2005.12.1
An experimental protocol demonstrating the protection of the carbonylgroup as 1,2,4-trioxane, the stability of the protecting group under a variety of reaction conditions, and the regeneration of the carbonylgroup with Triton B in THF at room temperature is presented. The method provides a useful alternative for the protection of carbonyl compounds having acid-sensitive moieties.
Structures of rengyosides A, B and C, three glucosides of Forsythia suspensa fruits
作者:Kazuhiko Seya、Katsuya Endo、Hiroshi Hikino
DOI:10.1016/s0031-9422(00)97772-0
日期:——
glucosides, rengyosides A, B and C, having as aglycones the reduced forms of phenylethanol were isolated from Forsythia suspensa fruits. Chemical and spectroscopic studies established the structures of these natural products to be 2-(1,4-dihydroxycyclohexyl)ethyl β- d -glucopyranoside, 2-(1-hydroxy-4-ketocyclohexyl)ethyl β- d -glucopyranoside and 2-(1,4-dihydroxycyclohexyl)ethyl β- d -6-O-[2-(4-hydroxypheny
Rengyol and seven related cyclohexylethanoid natural products have been synthesized in a stereocontrolled manner from a common starting material. In the present study the absolute configuration of the three chiral products has been determined and the first synthesis of a cyclohexylethanoid natural product bearing an oxetane ring has been accomplished.