A One Step Generation of α-Lithiotrimethylsilylalkanephosphonates. A New Preparative Route to Dialkyl 1-(Trimethylsilyl)alkanephosphonates and Vinylphosphonates
Enantioselective Lewis base catalyzed phosphonyldifluoromethylation of allylic fluorides using a <i>C</i>-silyl latent pronucleophile
作者:You Zi、Markus Lange、Ivan Vilotijevic
DOI:10.1039/d0cc01815e
日期:——
The first enantioselective phosphonyldifluoromethylation is enabled by the use of diethyl (difluoro(trimethylsilyl)-methyl)phosphonate reagent as a latent pronucleophile in the Lewisbasecatalyzed substitution of allylic fluorides. The reaction proceeds as a kinetic resolution to produce both the difluoromethylphosphonate products and the remaining fluorides in good yields and with high stereoselectivity
Novel One-pot Three-component Coupling Reaction with Trimethylsilylmethyl-phosphonate, Acyl Fluoride, and Aldehyde through the Horner–Wadsworth–Emmons Reaction
作者:Taiki Umezawa、Tomoya Seino、Fuyuhiko Matsuda
DOI:10.1021/ol301879a
日期:2012.8.17
A novelthree-component coupling between trimethylsilylmethylphosphonate, acyl fluoride, and aldehyde has been developed. A sequential nucleophilic addition of lithio-trimethylsilylmethylphosphonate to the acyl fluoride and Horner–Wadsworth–Emmons reaction of an aldehyde with the lithio-β-ketophosphonate generated in situ by desilylation at the α-position of the α-silyl-β-ketophosphonate by fluoride