Organocatalytic Asymmetric Mannich/Aza-Michael Cascade Reaction of δ-Formyl-α,β-unsaturated Ketones with Cyclic <i>N</i>-Sulfimines: Enantioselective Synthesis of Benzosulfamidate-Fused Pyrrolidines
作者:Hanna Kim、Yerin Kim、Sung-Gon Kim
DOI:10.1021/acs.joc.7b01533
日期:2017.8.4
A catalytic highly enantioselectiveMannich/aza-Michael cascade reaction of δ-formyl-α,β-unsaturated ketones with cyclic N-sulfimines, promoted by diphenylprolinol TMS ether as an organocatalyst, has been developed for the synthesis of chiral benzosulfamidate-fused pyrrolidines, which generated in good yields and with high diastero- and enantioselectivities. Further chemical transformations have been
Bifunctional Polymeric Organocatalysts and Their Application in the Cooperative Catalysis of Morita–Baylis–Hillman Reactions
作者:Cathy Kar-Wing Kwong、Rui Huang、Minjuan Zhang、Min Shi、Patrick H. Toy
DOI:10.1002/chem.200601197
日期:2007.3.5
these polymeric reagents contained either alkyl alcohol or phenol groups on the polymer backbone. The use of these materials as organocatalysts in a range of Morita-Baylis-Hillman reactions indicated that hydroxyl groups could participate in the reactions and accelerate product formation. In the cases examined, phenol groups were more effective than alkyl alcohol groups for catalyzing the reactions
Influence of Michael Acceptor Stereochemistry on Intramolecular Morita−Baylis−Hillman Reactions
作者:Wen-Dong Teng、Rui Huang、Cathy Kar-Wing Kwong、Min Shi、Patrick H. Toy
DOI:10.1021/jo051802l
日期:2006.1.1
A study of the effect of Michael acceptor stereochemistry on the efficiency of intramolecular Morita−Baylis−Hillman (MBH) reactions has been performed. The reactions were catalyzed by a phosphine, and the reaction substrates studied were enones containing a pendant aldehyde moiety attached at the β-position of the alkene group. In all cases examined with PPh3 as the catalyst, cyclization substrates