A new method for the radical deoxygenation of tertiary alcohols
作者:Derek H. R. Barton、David Crich
DOI:10.1039/c39840000774
日期:——
Tertiaryalcohols can be dexygenated in a radical chain reaction based on their mixed oxalate esters with N-hydroxy-2-thiopyridone, these esters being obtained directly from the alcohols and chloride etc, or via their trimethylsilyl derivatives.
Azo anions in synthesis: α-amino carbanion equivalents from t-butyldiphenyl-methylhydrazones
作者:Jack E. Baldwin、Robert M. Adlington、Ian M. Newington
DOI:10.1039/c39860000176
日期:——
α-Aminocarbanionequivalents (NH2) and α-hydrazino anionequivalents (NHNH2) are readily accessible from the C-alkylation products of t-butyldiphenylmethylhydrazones; these azoalkanes can be efficiently transformed into amines, hydrazines, and also alkanes under mild reaction conditions.
Metacycloprodigiosin, an analog of prodigiosin, was isolated from Streptomyces longisporus ruber, and shown to have structure 1. An exhaustive reduction technique, instrumental in elucidating the structure of 1 has been generally applied to the reduction of alkylpyrroles. Novel features in the mass spectral cracking pattern of alkylpyrroles and other heterocyclic systems are discussed.
Radical-chain deoxygenation of tertiary alcohols, protected as their methoxymethyl (MOM) ethers, using thiols as polarity-reversal catalysts
作者:Hai-Shan Dang、Paola Franchi、Brian P. Roberts
DOI:10.1039/b000533i
日期:——
The deoxygenation of tertiaryalcohols can be accomplished by heating their MOM ethers in the presence of a peroxide initiator and a thiol catalyst: the proposed radical-chain mechanism is supported by EPR spectroscopic studies.
Deoxygenation of tertiary and secondary alcohols ROH by thiol-catalysed radical-chain redox decomposition of derivatives ROCH2X to give RH and XCHO
作者:Hai-Shan Dang、Brian P. Roberts
DOI:10.1039/b202411j
日期:2002.4.26
electron-donating alkoxy, aryl or amido group, undergo thiol-catalysed radical-chain decomposition to give RH and XCHO. This reaction has been applied for the deoxygenation of representative tertiary and secondary alcohols ROH under metal-free conditions that require no stoichiometric co-reactant. Of the derivatives investigated, methoxymethyl (MOM) ethers and 1-alkoxymethylpyrrolidin-2-ones (PYRM ethers)