Inhibitory potency of lithocholic acid analogs and other bile acids on glucuronosyltransferase activity in a colon cancer cell line
摘要:
The effectiveness of analogs of lithocholic acid and other bile acids in inhibiting glucuronosyltransferase activity in a colon cancer cell line was measured in order to identify structural features critical for inhibition of the enzyme. Analogs of lithocholic acid with modifications of the side chain (2-7) were synthesized, in part, to study their inhibitory effects on glucuronosyltransferase activity. Bishomolithocholic acid (4) was synthesized from the iodo derivative (9) by a free radical Michael type reaction using tris(trimethylsilyl)silane as a free radical mediator.
The effectiveness of analogs of lithocholic acid and other bile acids in inhibiting glucuronosyltransferase activity in a colon cancer cell line was measured in order to identify structural features critical for inhibition of the enzyme. Analogs of lithocholic acid with modifications of the side chain (2-7) were synthesized, in part, to study their inhibitory effects on glucuronosyltransferase activity. Bishomolithocholic acid (4) was synthesized from the iodo derivative (9) by a free radical Michael type reaction using tris(trimethylsilyl)silane as a free radical mediator.
Photocatalytic Cleavage of Trityl Protected Thiols and Alcohols
We report the visible light photocatalytic cleavage of trityl thioethers or ethers under pH-neutral conditions. The method results in the formation of the respective symmetrical disulfides and alcohols in moderate to excellent yield. The protocol only requires the addition of a suitable photocatalyst and light rendering it orthogonal to several functionalities, including acid labile protective groups