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2004
Etherification
O 0328
Iridium-Catalyzed Intermolecular Allylic Etherification with Aliphatic AlkoxAsymmetric Synthesis of Dihydropyrans and Dihydrofurans. — The first
52- 047 ides:
general and highly selective allylic etherification with both primary and secondary
aliphatic alkoxides is reported. Reactions with tertiary alkoxides also result in the formation of allylic ether products albeit with lower enantioselectivities and longer reaction times. The present new method can also be applied to the preparation of asymmetric disubstituted dihydropyrans and dihydrofurans by subsequent ring-closing metathesis with Grubbs' catalyst. — (SHU, C.; HARTWIG*, J. F.; Angew. Chem., Int. Ed. 43
(2004) 36, 4794-4797; Dep. Chem., Yale Univ., New Haven, CT 06520, USA; Eng.)
— S. Adam
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