作者:Annabella F. Newton、Stephen J. Roe、Jean-Christophe Legeay、Pooja Aggarwal、Camille Gignoux、Nicola J. Birch、Robert Nixon、Marie-Lyne Alcaraz、Robert A. Stockman
DOI:10.1039/b907720k
日期:——
Two-directional cross-metathesis of a range of α,ω dienes with a variety of electron deficient alkenes has been accomplished. It was found that the process is quite general and gives complete selectivity for the E,E-dienes, making this a very useful and high yielding protocol for two-directional chain elongation.
Combining two-directional synthesis and tandem reactions: a short formal synthesis of halichlorine
作者:Camille Gignoux、Annabella F. Newton、Alexandre Barthelme、William Lewis、Marie-Lyne Alcaraz、Robert A. Stockman
DOI:10.1039/c1ob06380d
日期:——
A short and efficient synthesis of an advanced intermediate (1) in the Clive route to halichlorine has been achieved in 12 steps and 13.2% yield by a combined two-directionalsynthesis/tandem reaction strategy.
Combining Two-Directional Synthesis and Tandem Reactions, Part 8: A Novel Condensation/Michael Addition/Cycloaddition/Fragmentation/Lactamisation Cascade
A tandem oxime formation/Michael addition/1,4-prototopic shift/[3+2]-cycloaddition of an acyclic symmetrical precursor results in a tricyclic isooxazolidine which then undergoes a further fragmentation/lactamisation cascade to generate a non-symmetrical tricyclic a-ketolactam as a single diastereomer.
Combining Two-Directional Synthesis and Tandem Reactions, Part 17: Expedient Formation of Functionalised Azabicycles
作者:Robert Stockman、Pooja Aggarwal、George Procopiou、Diane Robbins、Gareth Harbottle、William Lewis
DOI:10.1055/s-0031-1290138
日期:2012.2
concise syntheses of anatoxin a, homoanatoxin, histrionicotoxin, alkaloid 223B and hippodamine (Figure 1), among others.1 Herein we report our investigations into the reaction of these keto dienoates with a range of primary amines, yielding azabicyclic structures pertinent to the synthesis of a range of frog alkaloids (e.g., alkaloid 275B2 and gephyrotoxin3) and the antitumour compounds, the lepadins
Two-directional synthesis and biological evaluation of alkaloid 5-epi-cis-275B′
作者:George Procopiou、Pooja Aggarwal、Annabella F. Newton、David Richards、Ian R. Mellor、Gareth Harbottle、Robert A. Stockman
DOI:10.1039/c4cc07287a
日期:——
The first total synthesis of myrmicine ant alkaloid 5-epi-cis-275B' (4) is presented. A tandem cyclisation established the entire core of the structure in a single transformation as well as the required 2,5-anti stereochemistry. Two-directional synthesis was used to furnish the cyclisation precursor 2, as in each of the subsequent steps towards the natural product. The first electrophysiology studies