Stereospecific Asymmetric Synthesis of Tertiary Allylic Alcohol Derivatives by Catalytic [2,3]‐Meisenheimer Rearrangements
作者:Xin Yu、Nick Wannenmacher、René Peters
DOI:10.1002/anie.202001725
日期:2020.6.26
Chiral acyclic tertiary allylicalcohols are very important synthetic building blocks, but their enantioselective synthesis is often challenging. A major limitation in catalytic asymmetric 1,2‐addition approaches to ketones is the enantioface differentiation by steric distinction of both ketone residues. Herein we report the development of a catalytic asymmetric Meisenheimer rearrangement to overcome
Zur Kenntnis ätherischer Öle. 2. Mitteilung. Die Struktur der sogenannten «Linalooloxide»
作者:Dorothee Felix、A. Melera、J. Seibl、E. Sz. Kováts
DOI:10.1002/hlca.19630460507
日期:——
Monoperphtalic acid oxidizes (−)-linaloöl in the cold to the expected diastereomeric pair of 6,7-dihydro-6,7-epoxy-linaloöls. These substances are unstable. On heating or on treatment with acid they are converted to a mixture of two pairs of diastereomeric oxides C10H18O2. The pair A/B, amounting to about 90% of the secondary product, are known as the linaloöl-oxides. They are shown to be tetrahydrofuran
在冷却下,单过苯二甲酸将(-)-linaloöl氧化为预期的非对映异构体对6,6-7,6-dihydro-6,7-epoxy-linalools。这些物质是不稳定的。在加热或用酸处理时,它们被转化为两对非对映体氧化物C 10 H 18 O 2的混合物。A / B对占次级产物的90%,被称为芳樟醇氧化物。它们显示为具有结构IV A和IV B的四氢呋喃衍生物。C / D对是结构III C和III D的非对映体四氢呋喃衍生物。
Oxidative Coupling of (−)-Sclareol and Related Diols Leading to Oxepane Terpenoids
作者:Hanane Bouanou、Juan A. Gil、Ramón Alvarez-Manzaneda、Rachid Chahboun、Enrique Alvarez-Manzaneda
DOI:10.1021/acs.joc.6b01834
日期:2016.10.21
Treatment of (−)-sclareol and related compounds with lead tetraacetate affords tetracycliccompounds bearing a 2,8-dioxabicyclo[5.2.0]nonane moiety with complete regio- and stereoselectivity. This process, which is also applicable to 1,5-diols with a similar substitution pattern, facilitates the development of efficientsyntheses toward oxepane terpenoids, such as aplysistatin derivatives.