Multifunctional chiral phosphines-catalyzed highly diastereoselective and enantioselective substitution of Morita–Baylis–Hillman adducts with oxazolones
作者:Yuan-Liang Yang、Cheng-Kui Pei、Min Shi
DOI:10.1039/c1ob00017a
日期:——
Multifunctional chiral phosphine (phosphine–thiourea type) L2-catalyzed allylicsubstitutions of MBH adducts 1 with oxazolones 2 produce the corresponding optically active adducts 3 in good to excellent yields and ee's as well as moderate to good de's under mild conditions. The synergistic interaction between hydrogen bond donor site and nucleophilic site has been discussed, indicating that finely
First simple, stereoselective synthesis of (E)-3-(nitroxymethyl)alk-3-en-2-ones from Baylis-Hillman adducts (4-hydroxy-3-methylenealkan-2-ones) is described. (C) 2000 Elsevier Science Ltd. All rights reserved.
Stereoselective Transformation of Baylis-Hillman Adducts into (3E)-3-(Alkoxymethyl)alk-3-en-2-ones
The pure (3E)-3-(methoxymethyl)alk-3-en-2-ones and (3E)-3-(ethoxymethyl)alk-3-en-2-ones are formed in the acid induced reaction of 4-hydroxy-3-methylenealkan-2-ones with methanol and ethanol, respectively.