3,6‐Dihydro‐2H‐thiopyrans are important structural motifs both in organic synthesis and medicinal chemistry. A continuous flow‐process for the photochemical generation of thioaldehydes from phenacyl sulfides and the ensuing [4+2]‐cycloaddition with electron‐rich 1,3‐dienes was developed. The cycloadducts were obtained with excellent yields in short reaction times and much improved productivities as
Transformation of thiosulphonates into α-sulphonyldisulphides, a new class of thioaldehyde precursors
作者:Gordon W. Kirby、Alistair W. Lochead、Gary N. Sheldrake
DOI:10.1039/c39840001469
日期:——
Toluene-p-thiosulphonates, RCH2SSO2 Tol (1) where R is an electron-withdrawing group are transformed readily into α-sulphonyldisulphides (2) which, with triethylamine, undergo fragmentation–elimination to give 2 moles of thioaldehydes, RCHS.
Protiodesilylation of 3-trimethylsilyl-2-thiabicyclo[2.2.1]hept-5-enes and derivatives: a stereochemical study
作者:Bianca F. Bonini、Enza Masi、Stefano Masiero、Germana Mazzanti、Paolo Zani
DOI:10.1016/0040-4020(96)00032-4
日期:1996.3
endo- and exo-trimethylsilyl-3-phenyl-2-thiabicyclo[2.2.1]hept-5-enes, the endo-trimethylsilyl-exo-S-oxide and their S,S-dioxide derivatives were protiodesilylated with fluoride ion. Stereoconvergent reactions were found, affording the endo-phenyl derivatives. These results can be rationalised with the hypothesis of a common carbanionic intermediate. In contrast, the desilylation of 3-endo-trimeth