A novel route to functionalized PFP esters via rapid intermolecular radical addition to PFP acrylate mediated by ethylpiperidinium hypophosphite (EPHP)

Synthetic applications of hypophosphite derivatives in reduction

The purpose of this review is to collect the applications in fine synthesis of hypophosphite derivatives as reducing agents.

New Synthesis of β-Sultams from Pentafluorophenyl Sulfonates

A stereoselective one-pot synthesis of substituted 1,2-thiazetidine 1,1-dioxides (beta-sultams) has been achieved from heterocyclic pentafluorophenyl (PFP) sulfonates. Mild N-O bond cleavage of isoxazolidines followed by intramolecular cyclization of the amine onto the PFP demonstrates the potential utility for using the PFP sulfonate as a valuable precursor to sulfonamides. [reaction: see text].

Novel Phosphorus Radical-Based Routes to Horsfiline

[reaction: see text]. Radicals derived from the phosphorus reagents, ethylpiperidine hypophosphite (EPHP) and diethylphosphine oxide (DEPO), are used in two related approaches to synthesis of the alkaloid horsfiline (1). In particular, DEPO proves beneficial for effecting cyclizations at 80 degrees C that are difficult or impossible with Bu(3)SnH.