α-苯硫醛可以使用简单的多步骤程序轻松制备,本文中将其作为 NHC 催化生成酰基唑鎓和烯醇化唑鎓中间体的新前体引入,这些中间体具有广泛的合成兴趣和实用性。用 NHC 预催化剂和碱处理 α-苯硫醛,通过Breslow 中间体产生有效的氧化还原重排,消除苯硫酚盐,随后回弹加成至生成的酰基唑鎓,得到相应的硫羟酸酯。在外部醇存在的情况下,氧化还原重排和氧化还原酯化之间的竞争可以通过明智地选择NHC预催化剂内的N-芳基取代基和反应中使用的碱来控制。以NEt 3为基体,带有吸电子( N -C 6 F 5或N -C 6 H 2 Cl 3 )取代基的NHC有利于氧化还原重排,而带有富电子N-芳基取代基( N -Ph, N )的三唑鎓预催化剂-Mes) 导致优先氧化还原酯化。使用DBU时,由于最初形成的硫羟酸酯产物发生酯交换反应,因此优选氧化还原酯化反应。此外,α-苯硫醛衍生的唑鎓烯醇化物已用于对映选择性形式[4
Tandem Pd/Au-Catalyzed Route to α-Sulfenylated Carbonyl Compounds from Terminal Propargylic Alcohols and Thiols
作者:Srijit Biswas、Rahul A. Watile、Joseph S. M. Samec
DOI:10.1002/chem.201304111
日期:2014.2.17
highly atom‐economical tandem Pd/Au‐catalyzed route to α‐sulfenylated carbonylcompounds from terminal propargylic alcohols and thiols has been developed. This one‐step procedure has a wide substrate scope with respect to substituents at the α‐position of the alcohol. Both aromatic and aliphatic thiols generated the α‐sulfenylated carbonyl products in good to excellent yields. A mechanism is proposed in
Regiospecific conversion of alkenyl sulphides to α-sulphenylated carbonyl compounds by oxygenation in the presence of thiophenol
作者:Jun-ichi Yoshida、Shogo Nakatani、Sachihiko Isoe
DOI:10.1039/c39880001468
日期:——
Regiospecificconversion of alkenyl sulphides to α-sulphenylated carbonylcompounds was achieved by oxygenation in the presence of thiophenol; electrolysis was found to be quite effective for initiation of the reaction.
Synthetic Potentialities of Alkyl and Aryl Cyclopropylidenealkyl Sulfides: Access to 1-(Arylthio)vinylcyclopropanes by a 1,3-Shift of an Arylthio Group
作者:Angela M. Bernard、Maria T. Cocco、Cenzo Congiu、G. Luca Franzone、Pier P. Piras
DOI:10.1055/s-1996-4222
日期:1996.3
Alkyl and aryl cyclopropylidenealkyl sulfides 2, 4 and 5 were converted to give access to 1-(arylthio)vinylcyclopropanes 3 by light induced or acid catalyzed 1,3-shift of the arylthio group. Some results on the reactivity of sulfides 2, 4 and 5 are reported.
Exopericyclic stereocontrol in Johnson–Claisen rearrangements of allylic sulfides
作者:Donald Craig、John W. Harvey、Alexander G. O'Brien、Andrew J. P. White
DOI:10.1039/c0cc01039a
日期:——
A study of the effects of exopericyclic stereocentres on the stereoselectivity of JohnsonâClaisen rearrangements of thioether-containing allylic alcohols shows that selectivity is highly dependent upon allylic substitution patterns.
Towards the Total Synthesis of Ambruticin: Preparation of the Fully Functionalised Right-Hand Portion Using the Intramolecular Silyl-Modified Sakurai (ISMS) Annulation
作者:István E. Markó、Daniel J. Bayston
DOI:10.1055/s-1996-4185
日期:1996.2
The concise synthesis of the fully functionalised right-hand dihydropyran subunit of the antifungal antibiotic ambruticin (1), using the ISMS annulation as the key-step, is described.