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2005
Pyridine derivatives
R 0380
A Mild and Efficient Synthesis of 2,5-Disubstituted 2,3-Dihydro-4-pyridones Catalyzed by Yb(OTf)3. — The aza-Diels—Alder reaction of the highly substituted buta35- 164 diene
(II) with N-benzhydryl imines is efficiently catalyzed by Yb(OTf)3 giving dihydropyridones in good yields. Similar results are obtained when the imines are formed
in situ from aldehydes (IV) and benzhydrylamine (V). — (CHENG, K.; ZENG, B.;
YU, Z.; GAO, B.; FENG*, X.; Synlett 2005, 6, 1018-1020; Key Lab. Green Chem.
Technol., Sichuan Univ., Chengdu, Sichuan 610064, Peop. Rep. China; Eng.) —
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