close

Вход

Забыли?

вход по аккаунту

?

код для вставки
2005
Benzopyran derivatives
R 0350
Chiral 2,6-Bis(oxazolinyl)pyridine—Rare Earth Metal Complexes as Catalysts
Highly Enantioselective 1,3-Dipolar Cycloaddition Reactions of 2-Benzopyry22- 137 for
lium-4-olates. — The combination of Sc(O-Tf)3 and Pybox-iPr (Ia) with or without
TFA leads to catalysts which allow highly diastereo- and enantioselective 1,3-dipolar
cycloaddition of α-keto esters and benzyloxyacetaldehydes to benzopyryliumolates.
Yb(O-Tf)3/Pybox-Ph (Ib) is an efficient catalyst for the asymmetric cycloaddition of
acrylate (X). — (SUGA*, H.; INOUE, K.; INOUE, S.; KAKEHI, A.; SHIRO, M.;
J. Org. Chem. 70 (2005) 1, 47-56; Dep. Chem. Mater. Eng., Fac. Eng., Shinshu Univ.,
Wakasato, Nagano 380, Japan; Eng.) — Jannicke
2005
Документ
Категория
Без категории
Просмотров
0
Размер файла
53 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа