N-hydroxypyridine-2(1H)-thione derivatives of carboxylic acids as activated esters. Part I. The synthesis of carboxamides
作者:Derek H.R. Barton、J. Albert Ferreira
DOI:10.1016/0040-4020(96)00487-5
日期:1996.7
The reaction between an acyl derivative of N-hydroxypyridine-2(1H)-thione (a Barton PTOC ester) and either an amine (primary or secondary), or the corresponding sulfenamide, led to the formation of a carboxamide in a clean transformation requiring minimal work-up and purification. The reaction with a sulfenamide is particularly useful since the only by-product, an unsymmetrical disulfide, is of both
Radical carbon–carbon coupling reactions via organoboranes
作者:Christine Cadot、Janine Cossy、Peter I. Dalko
DOI:10.1039/b001903h
日期:——
Alkylboronic esters give rise to free-radical alkylation products in the presence of phenylcarbonyloxy(pyridine-2-thione) (Barton’s ester) and a variety of Michael acceptors under irradiation.
Generation and fate of nondecarboxylating acyloxy radicals derived from the photolysis of acyl derivatives of N-hydroxy-2-thiopyridone
作者:Derek H.R. Barton、Manlan Ramesh
DOI:10.1016/s0040-4039(00)94400-9
日期:1990.1
The acyl derivatives of 1 with the acyl group linked to aryl, vinyl etc. give on photolysis carboxy radicals. These radicals, by attack on the thiopyridone function, afford thio-peresters which are the real precursors of the anhydrides observed before. The benzoyloxy radical from 2 can be trapped by ethylvinyl ether to give adduct 14 in promising yield.
New Reactions of the Thiocarbonyl Function. The Synthesis of Hindered Peptides
作者:Derek H. R. Barton、J. Albert Ferreira
DOI:10.1080/10426509708545507
日期:1997.1.1
chemistry of the thiocarbonyl function has been expanded to include the concerted reaction between an O-acyl derivative of N-hydroxypyridine-2(1H)-thione (a Barton PTOC ester) and a sulfenamide. The atom-economical process spawned a carboxamide and an unsymmetrical disulfide of synthetic and biological value. The reaction was successfully applied to the synthesis of sterically encumbered, urethane-protected
A rubber composition comprising a compound having one or more groups represented by formula (X) and a rubber component is provided.
wherein ring W
1
represents a cyclic group having at least one selected from the group consisting of —C(═O)— and —C(═S)—; N
10
represents a nitrogen atom; the at least one selected from the group consisting of —C(═O)— and —C(═S)— in the ring W
1
and N
10
are conjugated; and Z
1
represents —O— or —S—.