Thionation of phosphoramidodichloridates and phosphoramidate diesters using phosphorus pentasulfide and hexamethyldisiloxane under microwave irradiation. Part 1
摘要:
A new, mild, efficient, and solvent-free microwave promoted synthesis of thiophosphoramidodichloridates and thiophosphoramidate diesters is described. The thionation reaction was accelerated with microwave irradiation using the combination of P4S10 and HMDO. The conversion of P=O to P=S by this method gave the desired product in higher yields and shorter reaction times as compared to conventional methods. (C) 2004 Elsevier Ltd. All rights reserved.
SUBSTITUTED NUCLEOSIDES, NUCLEOTIDES AND ANALOGS THEREOF
申请人:ALIOS BIOPHARMA, INC.
公开号:US20140179627A1
公开(公告)日:2014-06-26
Disclosed herein are nucleotide analogs, methods of synthesizing nucleotide analogs and methods of treating diseases and/or conditions such as a HCV infection with one or more nucleotide analogs.
Phosphomonoesters and phosphodiesters derived from the photohydrolysis of 2-methoxy-5-nitrophenyl substituted phosphotriesters
作者:Nilsa R. Graciani、Daniel S. Swanson、Jeffery W. Kelly
DOI:10.1016/0040-4020(94)01012-o
日期:1995.1
Phosphotriesters composed of one or two 2-methoxy-5-nitrophenyl group(s) can be quantitatively photohydrolyzed in aqueous acetonitrile to yield the desired phosphodiester or phosphomonoester, respectively. Photohydrolysis occurs by attack of hydroxide at both the phosphoryl phosphorus and at the ipso-carbon in the triplet exited state of the 2-methoxy-5-nitrophenyl substituted phosphoesters. The photophysical studies
imide -amide rearrangement of cyclic phosphorimidates. As a result of this work new types of oligomeric organophosphorus compounds, formed by a novel 1,4-addition type ring opening polymerisation, were identified. These compounds are the stable intermediates of the imide-amide rearrangement, which upon heating yield the previously reported rearranged product. A detailed study of the mechanism of the Lewis
Novel acid catalysed 1,4-addition-type ring-opening polymerisation of cyclic phosphorimidates
作者:Eurico J. Cabrita、Sara X. Candeias、Ana M. Ramos、Carlos A.M. Afonso、A. Gil Santos
DOI:10.1016/s0040-4039(98)80040-3
日期:1999.1
New phosphorus containing oligomeric compounds of general formula (NR1CH2CHR2OP(O)R)n, analogous to polypeptides, were isolated and characterised. These are stable intermediaries in the acid catalysed imide-amide rearrangement of cyclic phosphorimidates through a ring-opening polymerisation, revealing an intermolecular two step mechanism for this rearrangement.
Synthesis of Phosphoramides for the Lewis Base-Catalyzed Allylation and Aldol Addition Reactions
作者:Scott E. Denmark、Xiping Su、Yutaka Nishigaichi、Diane M. Coe、Ken-Tsung Wong、Stephen B. D. Winter、Jun Young Choi
DOI:10.1021/jo9820723
日期:1999.3.1
Both chiral and achiral phosphoramides of diverse structure were prepared from diamines by the coupling to phosphorus(V) or phosphorus(III) reagents. Several enantiopure 1,2-diphenyl-1,2-ethanediamine analogues have been prepared by the reductive coupling of the corresponding N-silylimine with NbCl(4)(THF)(2) and subsequent resolution by the formation of diastereomeric menthyl carbamates. (S,S)-N,