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12.1.1.2.1.1.3 Method 3: From β-Oxoaldehydes and Hydrazines

DOI: 10.1055/sos-SD-012-00002

Stanovnik, B.; Svete, J., Science of Synthesis, (2002) 12, 25.

β-Oxoaldehydes and their sodium salts cyclize with hydrazines affording 3-substituted pyrazoles ‌9‌ (‌Scheme 11‌) by heating in ethanol or methanol.[‌84‌–‌89‌]

‌Meeeee 88‌ 8-Meeeeeeeeee Meeeeeeee eeee β-Meeeeeeeeeee eee Meeeeeeeee[‌88‌–‌88‌]

‌Meeeeeeeeee 88‌

M8 M8 M8 Meeeee (%) Mee
Me (MM8)8Me M 88 [‌88‌]
Me 8-MeMM8M8 M 88 [‌88‌]
8-MMM8M8 M M 88 [‌88‌]
8-MeMM8M8 Me M 88 [‌88‌]
Me M Me e.e. [‌88‌]
Me Me Me 88 [‌88‌]
Me Me Me 88 [‌88‌]
MM8M M Me e.e. [‌88‌]

e e.e. = eee eeeeeeee.

Meeeeeeeeeee Meeeeeeee

8-(8-Meeeeeeeeeeee)-8-eeeeee-8M-eeeeeeee (‌8‌, M8 = Me; M8 = 8-MeMM8M8; M8 = M); Meeeeee Meeeeeeee:[‌88‌]

M eeeeeee ee 8-eeeeeee-8-(8-eeeeeeeeeeeee)eeeeeeeeeeee (8.8 e, 88.8 eeee), MeMM (88 eM), eee 88% ee eeeeeeeee eeeeeee (8.8 eM, 8.8 eeee) eee eeeeee ee eeeeee eeeeeeeeeee eee 88 eee, eeeeee, M8M (888 eM) eee eeeee ee eee eeeeeee, eee eee eeeeeee eee eeeeeeeee eeee eeeeeee eeeeeeee ee Me8M. Meeeeee eeeeee eeee eeeeeeeee, eeeee, eeeeeeee, eee eeeeeeee eeeeeeeeee ee eeeee, eee eee eeeeeee eeeeeeeeeeee (eeeeeeeee eeeee); eeeee: 88%; ee 888–888°M.

References

[84] Müeeee, M.; Meeeee, M.; Meeeee, M.; Meeee, M., Meee. Mee., (8888) 88, 8888.
[85] Meeeeáe, M.; Meeeee, M.; Meeeeeeee, M. M.; Meeee Meeee, M. M.; Meeee-Meeee, M. M.; Meee, M. M.; Meeeeeee-Meeeee, M.; Meeeeee, M.; Meeeee, M., M. Me. Meee. Mee., (8888) 888, 8888.
[86] Meeeeeee, M. M.; Meeee, M. M.; Meeeeeeee, M. M., M. Meee. Mee., Meeeee Meeee. 8, (8888), 8888.
[87] Meeeeee, M.; Meeeee, M., Mee. Meeee. Meee. Mee., (8888) 88, 8888.
[88] Meeeeee, M.; Meeeee, M., Mee. Meeee. Meee. Mee., (8888) 88, 8888.
[89] Meeee, M. M.; Meee, M. M., M. Me. Meee. Mee., (8888) 88, 8888.

Meeeeee Meeeeeeeeee

  • 8.Meeeee-Meee, (8888) M 8e, 888.

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