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A Novel Route to Tetracyclic Fused Tetrazines and Thiadiazines.

✍ Scribed by Ikhlass M. Abbas; Sayed M. Riyadh; Magda A. Abdallah; Sobhy M. Gomha

Publisher
John Wiley and Sons
Year
2006
Weight
29 KB
Volume
37
Category
Article
ISSN
0931-7597

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✦ Synopsis

Abstract

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A novel route to tetracyclic fused tetra
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## Abstract magnified image The reaction between 3‐amino‐2,3‐dihydro‐7,9‐dimethyl‐2‐thioxo‐pyrido[3β€²,2β€²:4,5]thieno[3,2‐__d__]‐pyrimidin‐4(1__H__)‐one **4** or its 2‐methylthio derivative **5** with hydrazonoyl halides **6** in dioxane in the presence of triethylamine under reflux has followed hete

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A seven-step cascade reaction-in which selective mesylation, epoxide formation, epoxide lysis, cyclization, reiterative oxidation, and nitrogen-oxygen exchange occur sequentially-facilitates the construction of the maleic anhydride moiety of CP molecules 1 and 2 (>93% yield per step). Unstable inter