Chelation and Nonchelation Control in the [3 + 4] and [3 + 5] Annulation Reactions of Benzyloxy-Substituted Dicarbonyl Electrophiles with Bis(trimethylsilyl) Enol Ethers
Can a Ketone Be More Reactive than an Aldehyde? Catalytic Asymmetric Synthesis of Substituted Tetrahydrofurans
作者:Sunggi Lee、Han Yong Bae、Benjamin List
DOI:10.1002/anie.201806312
日期:2018.9.10
O‐heterocycles bearing tetrasubstituted stereogenic centers are prepared via catalytic chemo‐ and enantioselective nucleophilic additions to ketoaldehydes, in which the ketone reacts preferentially over the aldehyde. Five‐ and six‐membered rings with both aromatic and aliphatic substituents, as well as an alkynyl substituent, are obtained. Moreover, 2,2,5‐trisubstituted and 2,2,5,5‐tetrasubstituted