Heterocyclic Acceptors in Diastereoselective Palladium Mediated [3+2] Cycloadditions
作者:Barry M. Trost、Steven A. King、Thomas N. Nanninga
DOI:10.1246/cl.1987.15
日期:1987.1.5
Whereas cyclohexenones and ketones are poor acceptors for palladium mediated cycloadditions of 2-trimethylsilylmethylallylacetate, oxygen heterocycles bearing such functionality react smoothly and with high diastereoselectivity.
shortage of enantioselective (3+2) reactions of ARPs. Herein, we report the highly enantio-, diastereo-, and regioselective (3+2) annulations of ARPs with nucleophilic α-thioacyl Rh(I)-carbenes under Rh(I)/(R)-BINAP catalysis, producing bicyclic dihydrothiophenes with multiple functionalities, three continuous chiral centers, and five prochiral centers in up to 97% yields and 99:1 er. Mechanistically, the
GRYNKIEWICZ G.; BARSZCZAK B.; ZAMOISKI A., SYNTHESIS, 1979, NO 5, 364-365
作者:GRYNKIEWICZ G.、 BARSZCZAK B.、 ZAMOISKI A.
DOI:——
日期:——
US4059595A
申请人:——
公开号:US4059595A
公开(公告)日:1977-11-22
Asymmetric synthesis of trans-4,5-dioxygenated cyclopentenone derivatives by organocatalyzed rearrangement of pyranones and enzymatic dynamic kinetic resolution
作者:João P.M. Nunes、Luís F. Veiros、Pedro D. Vaz、Carlos A.M. Afonso、Stephen Caddick
DOI:10.1016/j.tet.2011.02.018
日期:2011.4
Dioxygenated cyclopentenones are versatile building blocks for the synthesis of several natural products. Herein we report a direct asymmetric synthesis of trans-4,5-dioxygenated cyclopentenone derivatives through base-catalyzed rearrangement of pyranones followed by dynamic kinetic resolution. Milder conditions than previously reported for this rearrangement have been found regarding amine base catalysis