Ketenimines bearing electron-withdrawing groups (X in 1) at the C2-position react with lithium trimethylsilyldiazomethanide [diazo(lithio) trimethylsilylmethane] to give 4-amino-3-trimethylsilylpyrazoles 4 or 5 mainly; in some cases 4-trimethylsilyl-1,2,3-triazole derivatives 3 were formed as the major products.
Organic Syntheses without Solvent: Preparation of Sulfones and Dithioacetals
作者:Georges Bram、André Loupy、Marie Claude Roux-Schmitt、Jean Sansoulet、Tekla Strzalko、Jacqueline Seyden-Penne
DOI:10.1055/s-1987-27843
日期:——
Sulfones are prepared by alkylation of sulfinate salts under solid-liquid phase-transfer catalysis without solvent; dithioacetals are obtained by heterogeneous uncatalyzed reactions of potassium arenethiolates and gem-dihaloalkanes. In both cases, the yields are high and the reaction conditions are mild. Some limitations are given.
The present invention relates to sulfone derivatives of formula (I):
Ar—SO
2
—CR
2
R
3
-L-N(R
1
)
2
I
wherein Ar, L, R
1
, R
2
and R
3
are as defined herein, and pharmaceutically acceptable salts and N-oxides thereof, useful in the treatment of a condition which is susceptible to treatment by modulation of 5-HT
7
receptor activity, such as depression or a sleep disorder.
Straightforward Access to Terminally Disubstituted Electron‐Deficient Alkylidene Cyclopent‐2‐en‐4‐ones through Olefination with α‐Carbonyl and α‐Cyano Secondary Alkyl Sulfones
作者:Lena Trifonov、Ayelet Rothstein、Edward E. Korshin、Olga Viskind、Michal Afri、Gregory Leitus、Krzysztof Palczewski、Arie Gruzman
DOI:10.1002/ejoc.202101258
日期:2021.12.28
A straightforward synthesis of virtually unexplored terminally disubstituted electron-deficient alkylidene cyclopent-2-en-4-ones was elaborated using activated secondary sulfones as alkylidene anion-radical synthons. The presented olefination process is proposed to rely on a base-promoted tandem or sequential Michael addition of C-nucleophiles to 4-acyl- or 4-silyloxycyclopent-2-en-1-ones followed