Task specific onium salt has been presented as soluble support in the synthesis of benzopyrans in this paper. This method allows for results by far superior to
A series of novel 7-amide substituted-4-androstene-3,17-dione derivatives(8αa '8αh or 8βa '8βh) was synthesized from the important intermediates 5 b
The carcinoembryonic antigen(CEA) is an oncofetal glycoprotein known as an important clinical tumor marker and is overexpressed in several types of tumors, incl