Construction of 2,3,4,5-tetrahydro-1,2,4-triazines via [4 + 2] cycloaddition of α-halogeno hydrazones to imines†
Hong-Wu
Zhao, 
*a
Hai-Liang
Pang,
a
Yu-Di
Zhao,
a
Yue-Yang
Liu,
a
Xiao-Qin
Chen,
a
Ning-Ning
Feng
a
and
Juan
Du
a
*a
Hai-Liang
Pang,
a
Yu-Di
Zhao,
a
Yue-Yang
Liu,
a
Xiao-Qin
Chen,
a
Ning-Ning
Feng
a
and
Juan
Du
a
Abstract
In the presence of sodium carbonate, the [4 + 2] cycloaddition of α-halogeno hydrazones to imines proceeded readily, and furnished 2,3,4,5-tetrahydro-1,2,4-triazines in moderate to high chemical yields.
![Graphical abstract: Construction of 2,3,4,5-tetrahydro-1,2,4-triazines via [4 + 2] cycloaddition of α-halogeno hydrazones to imines](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C6RA27767E&imageInfo.ImageIdentifier.Year=2017)
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