This work was supported by the Spanish Ministerio de Educacion y Ciencia (MEC) (Projects BQU2000-1500 and BQU2003/04413). E. Q., J. D. and V. H. acknowledge predoctoral grants from the same source.
Length-Selective Synthesis of Acylglycerol-Phosphates through Energy-Dissipative Cycling
作者:Claudia Bonfio、Cécile Caumes、Colm D. Duffy、Bhavesh H. Patel、Claudia Percivalle、Maria Tsanakopoulou、John D. Sutherland
DOI:10.1021/jacs.8b12331
日期:2019.3.6
Starting with a mixture of activated carboxylic acids of different lengths, iterative cycling of acylation and hydrolysis steps allowed for the selection of longer-chain acylglycerol-phosphates. Our results suggest that a selection pathway based on energy-dissipative cycling could have driven the selective synthesis of phospholipids on early Earth.
Iridium-catalyzed direct asymmetric vinylogous allylic alkylation
作者:Chang-Yun Shi、Jun-Zhao Xiao、Liang Yin
DOI:10.1039/c8cc07249c
日期:——
alkylation of α,β-unsaturated lactones (including coumarins) was achieved with excellent regio- and enantioselectivity. Transformations of the product were carried out by means of the versatile terminal olefin and lactonemoieties. The synthetic application of the present methodology was showcased by the asymmetric synthesis of an advanced synthetic Merck intermediate toward a new drug candidate.
Further reactions of t-butyl 3-oxobutanthioate and t-butyl 4-diethyl-phosphono-3-oxobutanthioate : Carbonyl coupling reactions, amination, use in the preparation of 3-acyltetramic acids and application to the total synthesis of fuligorubin A.
作者:Steven V. Ley、Stephen C. Smith、Peter R. Woodward
DOI:10.1016/s0040-4020(01)88210-7
日期:1992.1
for the preparation of homologated derivatives suitable for amination in the presence of silver (I) trifluoroacetate to afford the corresponding β-ketoamides is discussed. In particular Wadsworth-Emmons coupling reactions of (2) with various carbonyl compounds gave good yields of E-substituted products. Many of the β-ketoamides were shown to be suitable precursors for 3-acyltetramic acids using a Dieckmann
A Peierls Transition in Long Polymethine Molecular Wires: Evolution of Molecular Geometry and Single-Molecule Conductance
作者:Wenjun Xu、Edmund Leary、Sara Sangtarash、Michael Jirasek、M. Teresa González、Kirsten E. Christensen、Lydia Abellán Vicente、Nicolás Agraït、Simon J. Higgins、Richard J. Nichols、Colin J. Lambert、Harry L. Anderson
DOI:10.1021/jacs.1c10747
日期:2021.12.8
implications. Polymethine cyanine dyes are fascinating molecular wires because up to a critical length, they have no bond-length alternation (BLA) and their electronic structure resembles a one-dimensional free-electron gas. Beyond this threshold, they undergo a symmetry-breaking Peierls transition, which increases the HOMO–LUMO gap. We have investigated cationic cyanines with central polymethine chains of