Synthesis of dinorcholane and 5β-cholane derivatives

Synthesis of 3α-chlorinated Methyl Lithocholate Derivatives

Methyl lithocholate (1), a bile acid derivative which contains a rigid steroid part as well as a flexible side chain, has been used as the starting material for the convenient synthesis of 3α-chlorinated methyl lithocholate, 3α-chloro-5β-cholan-24-oic acid methyl ester (2), and three other chlorinated derivatives, 3α-chloro-5β-cholan-24-ol (3), 3α-chloro-5β-cholan-24-yl tosylate (4) and ethyl (3α-chloro-5β-cholan)-24-yl oxalate (5). The identity of all these synthesised steroidal molecules (2–5) has been determined by spectroscopic analyses.

Synthesis and spectroscopic characterisation lithocholic acid derivatives

The synthesis of five lithocholic acid derivatives, 5β-cholane-3α,24-diol (2), 3α-hydroxy-5β-cholan-24-yl tosylate (3), 5β-cholan-3α,24-yl ditosylate (4), 3α-tosyloxy-5β-cholan-24-yl chloride (5) and 3-oxo-5β-cholan-24-al (6) have been described.

Synthesis of Pregnenolone and Methyl Lithocholate Oxalate Derivatives

Five new steroidal oxalate derivatives, oxalic acid (pregn-5-en-20-one)-3β-yl ethyl ester (2), oxalic acid mono (pregn-5-en-20-one)-3β-yl ester (3), chloro-oxo-acetic acid (5β-cholan-24-oic acid methyl ester)-3α-yl ester (5), oxalic acid mono (5β-cholan-24-oic acid methyl ester)-3α-yl ester (6) and oxalic acid (5β-cholan-24-oic acid methyl ester)-3α-yl ethyl ester (7) were synthesized, respectively, from pregnenolone (1) and methyl lithocholate (4) using excess oxalyl chloride.

Steroids: partial synthesis in medicinal chemistry

This article reviews the progress in the chemistry of the steroids that was published between January and December 2004. The reactions and partial synthesis of estrogens, androgens, pregnanes, cholic acid derivatives, cholestanes and vitamin D analogues are covered. There are 127 references.