Total Synthesis of Gambierol: The Generation of the A–C and F–H Subunits by Using a C-Glycoside Centered Strategy
作者:Utpal Majumder、Jason M. Cox、Henry W. B. Johnson、Jon D. Rainier
DOI:10.1002/chem.200500993
日期:2006.2.8
Gambierol, a representative of the marine ladder toxin family, consists of eight ether rings, 18 stereocenters, and two challenging pyranyl rings having methyl groups that are in a 1,3-diaxial orientation to one another. Herein we describe the generation of gambierol's A-C and F-H ring systems and demonstrate the versatility of the glycosyl anhydride, enol ether-olefin RCM strategy to fused polycyclic
Synthesis of Functionalized γ-Lactone via Sakurai <i>exo</i>-Cyclization/Rearrangement of 3,3-Bis(silyl) Enol Ester with a Tethered Acetal
作者:Zhiping Yin、Zengjin Liu、Zhenggang Huang、Yang Chu、Zhiwen Chu、Jia Hu、Lu Gao、Zhenlei Song
DOI:10.1021/acs.orglett.5b00437
日期:2015.3.20
functionalized γ-lactones has been developed involving Sakurai exo-cyclization/rearrangement of 3,3-bis(silyl) enolesters with a tethered acetal. While the steric and electronic effects of geminal bis(silane) favor the desired Sakurai pathway, the methoxy species formed in the deprotection step also facilitates both cyclization and rearrangement. The synthetic value of this approach has been demonstrated by efficiently
Synthesis of Azabicycles via Cascade Aza-Prins Reactions: Accessing the Indolizidine and Quinolizidine Cores
作者:Freda K. I. Chio、Sébastien J. J. Guesné、Lorraine Hassall、Thomas McGuire、Adrian P. Dobbs
DOI:10.1021/acs.joc.5b01301
日期:2015.10.16
studies of intramolecular aza-Prins and aza-silyl-Prins reactions, starting from acyclic materials, are reported. The methods allow rapid and flexible access toward an array of [6,5] and [6,6] aza-bicycles, which form the core skeletons of various alkaloids. On the basis of our findings on the aza-Prins and aza-silyl-Prins cyclizations, herein we present simple protocols for the intramolecular preparation
The stereoselective syntheses of substituted furo[2,3b]furans.(part II)
作者:Jan Vader、Hubert Sengers、Aede de Groot
DOI:10.1016/s0040-4020(01)80074-0
日期:1989.1
Substituted furo[2,3b]furans, furo[2,3b]furan-2-ols and furo[2,3b]furan-2-ones were synthesized in a stereoselective manner. The key steps were the reactions of α-lithio-nitriles and dilithio-carboxylates with mono-substituted oxiranes.