Rapid and Selective in situ Reduction of Pyridine-N-oxides with Tetrahydroxydiboron
作者:Allyn Londregan、David Piotrowski、Jun Xiao
DOI:10.1055/s-0033-1340010
日期:——
Pyridine-N-oxides are often used as reactive precursors in the syntheses of substituted pyridines. Isolation and subsequent reduction of the associated pyridine-N-oxide intermediates can be challenging. We have discovered that tetrahydroxydiboron functions as a mild, versatile, and remarkably selective reducing agent for pyridine-N-oxides and may be used in an in situ fashion, thus obviating the isolation of N-oxide-containing intermediates
Bromination of some pyridine and diazine N-oxides
作者:William W. Paudler、Misa V. Jovanovic
DOI:10.1021/jo00155a027
日期:1983.4
Discovery and Optimization of a Porcupine Inhibitor
作者:Athisayamani Jeyaraj Duraiswamy、May Ann Lee、Babita Madan、Shi Hua Ang、Eldwin Sum Wai Tan、Wei Wen Vivien Cheong、Zhiyuan Ke、Vishal Pendharkar、Li Jun Ding、Yun Shan Chew、Vithya Manoharan、Kanda Sangthongpitag、Jenefer Alam、Anders Poulsen、Soo Yei Ho、David M. Virshup、Thomas H. Keller
DOI:10.1021/acs.jmedchem.5b00507
日期:2015.8.13
Wnt proteins regulate various cellular functions and serve distinct roles in normal development throughout life. Wnt signaling is dysregulated in various diseases including cancers. Porcupine (PORCN) is a membrane-bound O-acyltransferase that palmitoleates the Wnts and hence is essential for their secretion and function. The inhibition of PORCN could serve as a therapeutic approach for the treatment of a number of Wnt-dependent cancers. Herein, we describe the identification of a Wnt secretion inhibitor from cellular high throughput screening. Classical SAR based cellular optimization provided us with a PORCN inhibitor with nanomolar activity and excellent bioavallability that demonstrated efficacy in a Wnt-driven murine tumor model. Finally, we also discovered that enantiomeric PORCN inhibitors show very different activity in our reporter assay, suggesting that such compounds may be useful for mode of action studies on the PORCN O-acyltransferase.
Deady, Leslie W.; Stanborough, Mark S., Australian Journal of Chemistry, 1981, vol. 34, # 6, p. 1295 - 1302