期刊
CHIRALITY
卷 15, 期 2, 页码 135-138出版社
WILEY
DOI: 10.1002/chir.10155
关键词
chiral Lewis acid; Diels-Alder reaction; titanium (IV); enantioselective; binaphthol
A new chiral Lewis acid catalyst 9 was prepared in situ from a 1:2 molar mixture of (R)-3,3'-di(2-mesitylethynyl)binaphthoI (6) and titanium(IV) isopropoxide at ambient temperature. The 3- and 3'-substituents on 6 were effective for preventing undesired aggregation between Ti(IV) complexes and increasing the enantioselectivity (up to 82% ee) in the Diels-Alder reaction of methacrolein with cyclopentadiene.
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