close

Вход

Забыли?

вход по аккаунту

?

код для вставки
2005
Pyrazole derivatives
R 0180
Synthesis and Relative Stability of 3,5-Diacyl-4,5-dihydro-1H-pyrazoles Prepared
by Dipolar Cycloaddition of Enones and α-Diazoketones. — Treatment of the tri21- 126 ones
(I) and (VI) with mesyl azide leads to the desired diazo ketones (II) and (VII) and
unexpected diacylpyrazoles. The latter are formed via retro-Michael reaction of the
former and subsequent dipolar [2 + 3] cycloaddition of fragments. This is confirmed
by independent formation of diacylpyrazoles from the diazo ketone (X) and methyl
vinyl ketone. The diacylpyrazoles are relatively unstable compounds which are not
easy to purify and handle. — (JUNG*, M. E.; MIN, S.-J.; HOUK, K. N.; ESS, D.; J.
Org. Chem. 69 (2004) 26, 9085-9089; Dep. Chem. Biochem., Univ. Calif.,
Los Angeles, CA 90095, USA; Eng.) — Jannicke
Документ
Категория
Без категории
Просмотров
0
Размер файла
24 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа