Simple, Chemoselective Hydrogenation with Thermodynamic Stereocontrol
摘要:
Few methods permit the hydrogenation of alkenes to a thermodynamically favored configuration when steric effects dictate the alternative trajectory of hydrogen delivery. Dissolving metal reduction achieves this control, but with extremely low functional group tolerance. Here we demonstrate a catalytic hydrogenation of alkenes that affords the thermodynamic alkane products with remarkably broad functional group compatibility and rapid reaction rates at standard temperature and pressure.
Simple, Chemoselective Hydrogenation with Thermodynamic Stereocontrol
摘要:
Few methods permit the hydrogenation of alkenes to a thermodynamically favored configuration when steric effects dictate the alternative trajectory of hydrogen delivery. Dissolving metal reduction achieves this control, but with extremely low functional group tolerance. Here we demonstrate a catalytic hydrogenation of alkenes that affords the thermodynamic alkane products with remarkably broad functional group compatibility and rapid reaction rates at standard temperature and pressure.
Chemo-enzymatic syntheses of drimane-type sesquiterpenes and the fundamental core of hongoquercin meroterpenoid by recombinant squalene–hopene cyclase
作者:Yukie Yonemura、Takuro Ohyama、Tsutomu Hoshino
DOI:10.1039/c1ob06419c
日期:——
Squalene–hopenecyclase (SHC) converts squalene (C30) into pentacyclic triterpenes of hopene and hopanol. A linear sesquiterpene, (6E,10E)-2,6,10-trimethyldodeca-2,6,10-triene, underwent cyclizationcatalyzed by SHC, affording the following six bicyclic sesquiterpenes (drimane skeleton) in relatively high yield (68%): drim-7(8)-ene, drim-8(12)-ene, drim-8(9)-ene, driman-8α-ol, driman-8β-ol, and the
Stereochemical editing logic powered by the epimerization of unactivated tertiary stereocenters
作者:Yu-An Zhang、Vignesh Palani、Alexander E. Seim、Yong Wang、Kathleen J. Wang、Alison E. Wendlandt
DOI:10.1126/science.add6852
日期:2022.10.28
The stereoselective synthesis of complex targets requires the precise orchestration of chemical transformations that simultaneously establish the connectivity and spatial orientation of desired bonds. In this work, we describe a complementary paradigm for the synthesis of chiral molecules and their isomers, which tunes the three-dimensional structure of a molecule at a late stage. Key to the success
Simple, Chemoselective Hydrogenation with Thermodynamic Stereocontrol
作者:Kotaro Iwasaki、Kanny K. Wan、Alberto Oppedisano、Steven W. M. Crossley、Ryan A. Shenvi
DOI:10.1021/ja412342g
日期:2014.1.29
Few methods permit the hydrogenation of alkenes to a thermodynamically favored configuration when steric effects dictate the alternative trajectory of hydrogen delivery. Dissolving metal reduction achieves this control, but with extremely low functional group tolerance. Here we demonstrate a catalytic hydrogenation of alkenes that affords the thermodynamic alkane products with remarkably broad functional group compatibility and rapid reaction rates at standard temperature and pressure.