3-Aryl-5-(2-pyridyl)pyrazoles and related compounds are easily accessible via the reaction of the appropriate 1,3-diketone with hydrazine hydrate. The central pyrazole rings show a far-reaching equalization of the bond lengths. In the crystalline state dimeric and strand-like structures are observed due to the formation of intermolecular N–H···N hydrogen bridges between the pyrazole N–H functionality
Deprotection of
<i>N</i>
‐
<i>tert</i>
‐Butoxycarbonyl (Boc) Protected Functionalized Heteroarenes via Addition–Elimination with 3‐Methoxypropylamine
作者:Zachary Z. Gulledge、Jesse D. Carrick
DOI:10.1002/ejoc.201901811
日期:2020.3.31
The utilization of 3‐methoxypropylamine as a mild deprotecting agent for various N‐Bocprotectedheteroarenesvia a proposed addition/elimination mechanism is described. Method development, application to various heteroarenes including indoles, 1,2‐indazoles, 1,2‐pyrazoles, and related derivatives, a ten‐fold scale‐up reaction, and experimental evaluation of a preliminary mechanistic hypothesis are