Reference EntryDOI
The Mitsunobu Reaction
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In this paper, the authors present a review of the literature on the MAD/triphenylphosphine redox system, with emphasis on the literature between 1981 and 1988.Abstract:
Alkyl and aryl phosphites and phosphines react with compounds having weak heteroatom–heteroatom bonds, such as SS, OO, etc., and with azo compounds to form reactive phosphonium salts. These phosphonium salts in turn promote “redox” condensation reactions with compounds having active hydrogens. The condensation reaction of alcohols using the redox couple of a triaryl- or trialkylphosphine and a dialkyl azodicarboxylate has become known as the Mitsunobu reaction, based on his pioneering work in the late 1960s. The overall reaction is summarized, wherein the alcohol (R1OH) and acidic compound (H–Nu) are condensed to form product (R1–Nu), while triphenylphosphine is oxidized to triphenylphosphine oxide and the azodicarboxylate is reduced to the hydrazine. Although the typical redox combination is diethyl azodicarboxylate (DEAD) and triphenylphosphine, many other combinations have found selected use. The reaction is generally limited to primary and secondary alcohols, although tertiary alcohols react in a few intramolecular and intermolecular reactions. For secondary alcohols the reaction usually proceeds with clean inversion of stereochemistry. The acidic component of the reaction generally has an aqueous pKa < 15, with intramolecular reactions providing the exceptions. Examples of H–Nu include oxygen nucleophiles such as carboxylic acids and phenols; nitrogen nucleophiles such as imides, hydroxamates, and heterocycles; sulfur nucleophiles such as thiols and thioamides; and carbon nucleophiles such as β-ketoesters.
Major reviews of the Mitsunobu reaction were published in 1981 by Mitsunobu and in 1983 by Castro. The former review concentrated on reactions using DEAD/triphenylphosphine, while the latter review focused on reactions in which halogens replaced the hydroxy group using reagents such as triphenylphosphine/carbon tetrachloride, triphenyl phosphite/iodomethane, and triphenylphosphine/N-halosuccinimide. Reactions involving the DEAD/triphenylphosphine redox system are the principal subject of this chapter, with emphasis on the literature between 1981 and 1988.
Keywords:
Mitsunobu reaction;
adduct formation;
alcohol activation;
SN2 reaction;
mechanisms;
carbon–oxygen bond;
carbon–nitrogen bond;
carbon–sulfur bond;
carbon–halogen bond;
carbon–carbon bond;
ambident nucleophiles;
dehydration;
alkenes;
method comparison;
ester formation;
lactone formation;
akyl aryl ether;
epoxides;
dialkyl ethers;
enol ethers;
dialkyl ethers;
imides;
azides;
experimental procedures;
scope;
limitationsread more
Citations
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References
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Journal ArticleDOI
Stereoselectivity in the electrophile-mediated cyclization of 2,3,5-tri-O-benzyl-1,2-dideoxy-d-arabino-hex-1-enitol. A stereocontrolled synthesis of 1-amino-2,5-anhydro-3,4,6-tri-O-benzyl-1-deoxy-d-glucitol
Fillmore Freeman,K. D. Robarge +1 more
TL;DR: In this paper, a cyclization of 2,3,5,tri-O-benzyl-1,2-dideoxy-d -arabino-hex-1-enitol with mercuric acetate, mercuranic trifluoroacetate, iodine, and N-bromosuccinimide gave preponderantly the allo isomer of the C-arabinofuranosyl structure.
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Mechanistic implications of 1,3,2.lambda.5-dioxaphospholanes in the Mitsunobu reaction
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α-monofluoromethyl and α-difluoromethyl putrescine as ornithine decarboxylase inhibitors: In vitro and in vivo biochemical properties
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Electrophilic sulfur transfer reactions in organic synthesis. Preparation of a diastereomer of the key macrocyclic component of griseoviridin
TL;DR: Synthese de benzyloxy carbonylamino-3 methyl-9 oxo-2 tetrahydro-3,4,8,9 oxathioninne-1,5 carboxylate-6 de methyle via la reaction sur le soufre du N-benzyloxycarbonyl S-phtalimido cysteinate de t-butyle avec l'anion derive d'oxo-3 (S)-t-butyldimethylsiloxy-5 caproate de methyl
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Synthesis, antiretrovirus effects, and phosphorylation kinetics of 3'-isocyano-3'-deoxythymidine and 3'-isocyano-2',3'-dideoxyuridine.
TL;DR: The silylated AzddThd 5 and AzddUrd 6 prepared from 2,3'-anhydronucleoside derivatives 3 and 4 were transformed to formamides 7 and 8 by using the sequence RN3----RN = P(C6H5)----RNHCHO to produce 3'-isocyano-3'-deoxythymidine and ddThd derivative 11 was considerably more toxic to MT-4 cells than ddUrd derivative 12.