Diastereofacial selectivity via aldol reactions using ethyl dithioacetate and ethyl dithiopropionate enolates
作者:A.I. Meyers、Robert D. Walkup
DOI:10.1016/s0040-4020(01)96754-7
日期:1985.1
The lithium enolate of ethyldithioacetate reacts with α-methyl aldehydes to yield the aldol products in which the syn configuration in the positions β and γ to the thiocarbonyl of the product is favored over the anti configuration. This selectivity is solvent-dependent, and is enhanced at lower temperatures. In most cases, syn:anti product ratios obtained under these conditions varied from 57:43 to
A Facile and Concise Synthesis of 2-Alkyl- and 2-Aryl-4-oxo- 4<i>H</i>thiopyrano[2,3-<i>b</i>]pyridines
作者:Axel Couture、Pierre Grandclaudon、Eric Huguerre
DOI:10.1055/s-1989-27288
日期:——
2-Alkyl- and 2-aryl-4-oxo-4H-thiopyrano[2,3-b]pyridine can be conveniently prepared by reacting the appropriate aromatic and aliphatic O-ethyl thiocarboxylates with the sodium derivative of various alkyl 3-(2-bromopyridyl) ketones.
The gas-phase pyrolysis of some primary and secondary thionacetates
作者:David B. Bigley、Rosemary E Gabbott
DOI:10.1039/p29750000317
日期:——
Alkyl thionacetates undergo thermal elimination by a homogeneous unimolecular mechanism to give alkenes and thioacetic acid as first products. With the primary esters there is an accompanying rearrangement to thiolacetate. A transition state similar to that for acetatepyrolysis is proposed for the eliminationreaction, but it is argued that it is more product-like in the thionester case.
A New and Concise Synthesis of 3-Aryl- and 3-Alkyl-1<i>H</i>-2-benzothiopyran-1-ones (Thioisocoumarins)
作者:Axel Couture、Hélène Cornet、Pierre Grandclaudon
DOI:10.1055/s-1990-27113
日期:——
3-Aryl- and 3-alkyl-1H-2-benzothiopyran-1-ones are readily accessible by reaction of the lithiated N,N-diethyl-o-toluamide (N,N-diethyl-2-methylbenzenecarboxamide) with appropriate aromatic, heteroaromatic and aliphatic thioesters.
The influence of substituents on preparation and tautomerism of open-chain β-thioketoesters
作者:F. Duus
DOI:10.1016/0040-4020(72)88125-0
日期:1972.1
the synthesis of β-thioketoesters, the acid catalysed reactions of 36 differently substituted β-keto esters with H2S have been studied under various conditions in order to determine the influence of the substituents on reaction course. gem-Dithiols may also be obtained in good yields by this reaction. Treatment of T1(I)-salts of β-thioketo esters with alkyl halides results exclusively in S-alkylation