Bisphosphonic Compounds. II. Preparation of Monophosphonic Starting Materials. Mixed Esters of Methylphosphonic Acid
摘要:
Methyl (1-methylethyl) methylphosphonate was obtained from PCl3 via (Pr(i)O)PCl2 and (Pr(i)O)P(OMe)2 followed by the Michaelis-Arbuzov reaction with Mel. The yield was 79 % with 95 % chemical purity. Less reasonable conversions were obtained for some related mixed diesters.
Organophosphorus chemistry. Part 1. The synthesis of alkyl methylphosphonic acids
作者:Christopher M. Timperley、Michael Bird、Ian Holden、Robin M. Black
DOI:10.1039/b007077g
日期:——
Several alkyl hydrogen methylphosphonates of structure RO(HO)P(O)Me were synthesised by a three-stage route [R = i-Pr, n-Bu, i-Bu, s-Bu, pinacolyl Me3C-CH(Me)-, cyclopentyl and cyclohexyl]. Trimethyl phosphite was transesterified with alcohols in the presence of sodium catalyst to give the mixed phosphites (MeO)2POR in 6–64% yield. Treatment of these with methyl iodide gave alkyl methyl methylphosphonates
Synthesis of Some Guanylhydrazones and Imidazolinylhydrazones as Thromboxane-Synthase and Platelet Aggregation Inhibitors
作者:N. Desideri、I. Sestili、P. Piccardoni、S. Rotondo、C. Cerletti、M. L. Stein
DOI:10.1002/ardp.19923251206
日期:——
The imidazolinylhydrazones of (3‐pyridinyloxy)‐acetaldehyde and of 6‐[3‐(2‐formyl‐pyridinyl)oxy]hexanoic acid were synthesized as cyclic analogues of the corresponding guanylhydrazones which were found to be selective inhibitors of human thromboxane‐synthase. The benzene isosters were also prepared in order to define the importance of the ring nitrogen for the activity.‐ Moreover, the guanyl‐ and
作者:I.Darren Grice、Peta J. Harvey、Ian D. Jenkins、Michael J. Gallagher、Millagahamada G. Ranasinghe
DOI:10.1016/0040-4039(95)02282-1
日期:1996.2
Treatment of a dialkyl phosphite with triphenylphosphine and diisopropyl azodicarboxylate in toluene, followed by addition of an alcohol, results in the formation of the corresponding trialkyl phosphite. Similarly, dialkyl phosphonites can be synthesised from monoalkyl phosphites (alkyl phosphinates).
Site-specific functionalisation of proteins by a Staudinger-type reaction using unsymmetrical phosphites
作者:Verena Böhrsch、Remigiusz Serwa、Paul Majkut、Eberhard Krause、Christian P. R. Hackenberger
DOI:10.1039/b926818a
日期:——
Unsymmetrical phosphites react efficiently in a Staudinger reaction with p-azido-phenylalanine, which can be applied for the biotinylation of proteins, thereby expanding the scope of the chemoselective Staudinger-phosphite reaction of aryl azides with symmetrical phosphites to the corresponding phosphoramidates.