A new electrochemical method of preparation of unsymmetrical disulfides
摘要:
A new method is described for the preparation of unsymmetrical disulfides by reaction of the electrogenerated sulfenium cation R-1-S+ with thiols or disulfides. (C) 1997 Elsevier Science Ltd.
A new electrochemical method of preparation of unsymmetrical disulfides
摘要:
A new method is described for the preparation of unsymmetrical disulfides by reaction of the electrogenerated sulfenium cation R-1-S+ with thiols or disulfides. (C) 1997 Elsevier Science Ltd.
Electrophilic substitutions with the electrogenerated sulfenium cation R1-S+
作者:Quang Tho Do、Driss Elothmani、Georges Le Guillanton
DOI:10.1016/s0040-4039(98)00871-5
日期:1998.6
The sulfenium cation R1-S+ electrogenerated by oxidation of organic disulfides, reacts with phenols, aromatic ethers and ketones bearing an hydrogen atom in α position, to give alkyl (aryl) sulfanyl compounds.
Use of the vinyl group as an efficient protecting group for azole N- atoms: Synthesis of polyfunctionalized imidazoles and thieno[2,3-d] ⇌ [3,2-d]imidazole
作者:David J. Hartley、Brian Iddon
DOI:10.1016/s0040-4039(97)00957-x
日期:1997.6
2 → 5 → 4 via Br → MgBr and other exchange reactions. Efficient removal of the vinyl groups from the resulting polyfunctionalized imidazoles was achieved with ozone or potassium permanganate. An extension of this methodology has allowed the first synthesis of thieno[2,3-d] ⇌ [3,2-d]-imidazole.
Sulfur-lithium exchange reaction of 2-substituted-2-(phenylthio)cyclopropanecarboxamides by LDMAN in THF at −50 °C proceeded with invertion of configuration, leading to the predominant formation of trans-2-substituted cyclopropanes, while in tin-lithium exchange, the configuration was maintained at −78 °C.