First and Efficient Synthesis of Phosphonodifluoromethylene Analogues of Nucleoside 3‘-Phosphates: Crucial Role Played by Sulfur in Construction of the Target Molecules
作者:Chrystel Lopin、Arnaud Gautier、Géraldine Gouhier、Serge R. Piettre
DOI:10.1021/ja027850u
日期:2002.12.1
corresponding difluoromethylene phosphonates as isopolar mimics, a single example of such an analogue featuring this particular substitution pattern has so far been reported in the literature, due to synthetic problems associated with their preparation. The lithium salt of diethyl difluoromethylphosphonothioate 28d provides a solution to this problem, as demonstrated by an 8-step synthesis of all five fully protected
Second-generation synthesis of protected phosphonothiodifluoromethylene analogues of nucleoside-3′-phosphates
作者:Irina Kalinina、Arnaud Gautier、Carmen Salcedo、Jean-Yves Valnot、Serge R Piettre
DOI:10.1016/j.tet.2004.03.082
日期:2004.5
A practical, eight-step synthesis of the key intermediate 14 in 19% overall yield from α-d-xylose is described. The preparation can be carried out on multi-gram scale and involves the use of the organomagnesium reagent 2d. The capability of derivative 14 to be transformed into the title compounds is examplified by the preparation of 15. Additionally, X-ray crystallography of intermediate 12 provided
Efficient interconversion of α,α-difluoromethylenephosphonates and α,α-difluoromethylenephosphonothioates
作者:Serge R. Piettre
DOI:10.1016/0040-4039(96)00912-4
日期:1996.7
Treatment of dialkyl 1,1-difluoromethylenephosphonates 1 with Lawesson's reagent cleanly produces the corresponding dialkyl 1,1-difluoromethylenephosphonothioates 2. The reaction can be extended to dialkyl 1,1-difluoromethylenephosphinates and to dialkyl 1,1-difluoromethylenephosphine oxides. The reversed transformation (i.e. converting dialkyl 1,1-difluoromethylenephosphonothioates into dialkyl 1
A conformational analysis using the Pseurot 6.3 software package of a modified nucleoside-3'-phosphate is reported and reveals that the phosphate mimic strongly influences the conformational behaviour of the ribose ring and shifts the North/ South equilibrium to a northern position. A rational classification by the group electronegativity of several phosphate analogues is presented. The lambda factor of the difluorophosphonate group in water (Diez-Donders generalised Karplus equation) is also determined. (c) 2005 Elsevier Ltd, All rights reserved.