Tandem Beckmann and Huisgen–White rearrangement as an alternative to the Baeyer–Villiger oxidation of the bicyclo[3.3.1]nonane system: first asymmetric synthesis of (–)-dihydropalustramic acid. X-Ray molecular structure of 2β-ethyl-9-phenylsulfonyl-9-azabicyclo[3.3.1]nonan-3-one
作者:Osamu Muraoka、Bao-Zhong Zheng、Kazuhito Okumura、Genzoh Tanabe、Takefumi Momose、Conrad Hans Eugster
DOI:10.1039/p19960001567
日期:——
The transformation of the ‘fork head ketone’ 3b into the corresponding bicyclic lactone 13 via the Beckmann followed by the Huisgen–White rearrangement is described. Application of the method to a homochiral 2-etyl-substituted bicyclic ketone (+)-3dα gave efficiently (–)-dihydropalustramic acid (–)-2a, a degradation product from the alkaloid palustrine 1, in good optical yield.
Abbau von Palustrin zu (−)-Dihydropalustraminsäure ((2<i>R</i>, 6<i>S</i>, 1′<i>S</i>)-[6-(1′-Hydroxypropyl)-2-piperidyl]essigsäure) und Struktur von Palustrin und Palustridin. Mitteilung über Schachtelhalmalkaloide
作者:Carl Mayer、Clinton Ludlow Green、Werner Trueb、Peter Christian Wälchli、Conrad Hans Eugster
DOI:10.1002/hlca.19780610238
日期:1978.3.8
Degradation of palustrin to (−)-dihydropalustramic acid ((2R,6S,1′S)-[6-(1′-hydroxypropyl)-2-piperidyl]acetic acid), and the structure of palustrin and palustridin