Abstract The diisopropyl (allylthiomethyl)phosphonates (variously substituted on the allylic group) are submitted to the [2,3]-sigmatropic rearrangement, via either the carbanions or the sulfonium ylides. Synthetic potentialities are examined, and in particular new (1-mercaptobut-3-enyl)phosphonates are conveniently prepared.
Reductions of phosphonodithioformates: Syntheses of β-phosphonyl thiols and hemidithioacetals.
作者:Hubert Makomo、Serge Masson、Monique Saquet
DOI:10.1016/s0040-4020(01)81760-9
日期:1994.8
The phosphonodithioformates appeared versatile precursors to the (mercaptomethyl)phosphonates and derivatives, through sodium borohydride reduction in acetonitrile heated under reflux. By contrast, when the reduction was performed at room temperature with sodium borohydride, the (mercapto-alkylthio-methyl)phosphonates were exclusively obtained; reduction with BH3-Me(2)S (BMS) or within lithium diisopropylaminoborohydride also led to these hemidithioacetals. The aforementioned products of reduction were characterized by the syntheses of various derivatives. In particular, S-phosphonyl trithiocarbonates, N-phenyl imidodithiocarbonate and dithiocarbamate were prepared.
Makomo, Hubert; Saquet, Monique; Simeon, Fabrice, Phosphorus, Sulfur and Silicon and the Related Elements, 1996, vol. 109, # 1-4, p. 445 - 448
The catalytic effectiveness of ruthenium porphyrins for ylide generation in reactions of ethyl diazoacetate and diisopropyl diazomethylphosphonate with allylic amines, sulfides and iodides is described for the first time. These reactions result mainly in products of the [2,3]-sigmatropicrearrangement of intermediate allylic ylides.