First total syntheses of bicyclic marine sesquiterpenoids drechslerines A and B
摘要:
The first total syntheses of the bicyclic sesquiterpenoids drechslerines A (1) and B (2), which were isolated from the algicolous fungus Drechslera dematioidea in the marine red alga Liagora viscida, has been accomplished starting from (S)-carvone (13) via three palladium-catalyzed reactions, namely, diastereoselective allylation, conjugate reduction, and carbon monoxide insertion, as the key reactions. (C) 2011 Elsevier Ltd. All rights reserved.
A convenient preparation of 3-isopropyl-1-methylcyclopentylmethanol and 1-isopropyl-3-methylcyclopentylmethanol via Favorskii rearrangement
作者:Martino Ambrosini、Nikla Baricordi、Simonetta Benetti、Carmela De Risi、Gian P. Pollini、Vinicio Zanirato
DOI:10.1016/j.tetasy.2009.08.016
日期:2009.9
The Favorskiirearrangement of suitable α-chloro derivatives of commercially available (+)- and (−)-carvone, and (−)-menthone served efficiently to prepare the title compounds featuring delicious fruity, floral olfactory notes.
Stereoselective synthesis of (6R)- and (6S)-diosphenol and Ψ-diosphenol
作者:David F Schneider、Murray S Viljoen
DOI:10.1016/s0040-4020(02)00492-1
日期:2002.6
Methods are discussed for the stereoselective synthesis of the (R)-and (S)-enantiomers of the diosphenols (5)–(8) by utilizing the commercially available stereoisomers (9), (12), (23) and (25) of carvone and limonene, respectively, as chiral starting materials.
Oxidoreduction between Cycloalkanols and Cycloalkanones in the Cultured Cells of<i>Nicotiana tabacum</i>. Simulation of the Time-courses in the Oxidation of (+)-Borneol and the Reduction of (−)-Carvomenthone
The time-courses in the oxidation of (+)-borneol and the reduction of (−)-carvomenthone in the cultured cells of Nicotiana tabacum were simulated on the basis of the permeability of 5- to 7-membered cycloalkanols and their corresponding cycloalkanones into the cultured cells and the 13C NMR chemical shift of the carbonyl carbon of (+)-camphor which is the oxidation product of (+)-borneol and (−)-carvomenthone which is a substrate for the reduction, respectively.
Platinum Nanoparticles Stabilized by Glycerodendrimers: Synthesis and Application to the Hydrogenation of α,β‐Unsaturated Ketones under Mild Conditions
Air-stable platinumnanoparticlesstabilized by glycerodendrimers were prepared in water and analyzed by TEM. These platinumnanoparticles showed good catalytic activity for the reduction of α,β-unsaturated ketones to saturated ketones at room temperature in water or in water/THF (1:1) under H2 (101.3 kPa). The catalytic species was recovered and recycled several times.
在水中制备由甘油树枝状聚合物稳定的空气稳定铂纳米颗粒并通过 TEM 进行分析。这些铂纳米颗粒在室温下在水中或在水/THF (1:1) 中,在 H2 (101.3 kPa) 下显示出良好的催化活性,可将 α,β-不饱和酮还原为饱和酮。催化物质被回收和循环多次。