Synthesis of 2,4-Dimethoxy-5-(3-oxo-1-alkynyl)pyrimidines, 2,4-Dimethoxy-5-(3-oxoalkyl)pyrimidines, and 5-(3-Oxoalkyl)uracils by a Highly Convenient Procedure
A silicon-mediated synthesis of novel 5-substituted 2,4-dimethoxypyrimidines and 5-substituted uracils
作者:Nitya G. Kundu、Biswajit Das、Anjali Majumdar、Lakshmi N. Choudhuri
DOI:10.1016/s0040-4039(00)96775-3
日期:1987.1
A highly efficient and general method for the synthesis of 5-(2-acylethynyl)-2,4-dimethoxypyrimidines starting from 2,4-dimethoxy-5-/2-(trimethylsilyl)ethynyl/pyrimidine is described. The 5-(2-acylethynyl)-2,4-dimechoxypyrimidines have been converted to 5-(2-acyl-1-iodovinyl) uracils and 5-(2-acylethynyl) uracils.
作者:KUNDU, NITYA G.、DAS, BISWAJIT、MAJUMDAR, ANJALI、CHOUDHURI, LAKSHMI N.
DOI:——
日期:——
Synthesis of 2,4-Dimethoxy-5-(3-oxo-1-alkynyl)pyrimidines, 2,4-Dimethoxy-5-(3-oxoalkyl)pyrimidines, and 5-(3-Oxoalkyl)uracils by a Highly Convenient Procedure
作者:Nitya G. Kundu、Biswajit Das、Anjali Majumdar
DOI:10.1055/s-1990-26843
日期:——
A simple synthesis of 2,4-dimethoxy-5-(3-oxoalkynyl)pyrimidines from the readily available 5-ethynyl-2,4-dimethoxypyrimidine is described. The sequence proceeds via an ethynylboron intermediate which is acylated with carboxylic anhydrides. The 5-(3-oxo-1-alkynyl) products are hydrogenated to the saturated analogs and these are O-dealkylated with chlorotrimethylsilane/sodium iodide to give 5-(3-oxoalkyl)uracils, e.g., 5-(3-oxobutyl)-, 5-(3-oxopentyl)-, and 5-(3-oxohexyl)uracil. These compounds and the nucleosides derived therefrom are of interest as anticancer and antiviral agents.