New α- and β-cyclodextrin derivatives with cinchona alkaloids used in asymmetric organocatalytic reactions

• Iveta Chena Tichá,
• Simona Hybelbauerová and
• Jindřich Jindřich

Beilstein J. Org. Chem. 2019, 15, 830–839, doi:10.3762/bjoc.15.80

• evaluated in several enantioselective reactions, specifically in the asymmetric allylic amination (AAA), which showed a promising enantiomeric excess of up to 75% ee. Furthermore, a new disubstituted α-CD catalyst was prepared as a pure AD regioisomer and also tested in the AAA. Our results indicate that (i

• disubstituted CD derivatives performed similarly to monosubstituted CDs. Therefore, these new CD derivatives with cinchona alkaloids effectively catalyze asymmetric allylic aminations and have the potential to be successfully applied in other enantioselective reactions. Keywords: asymmetric allylic amination

• asymmetric allylic amination (AAA). We successfully prepared a series of monosubstituted α- and β-CDs derivatives with the cinchona alkaloids cinchonine, cinchonidine, quinine, and quinidine with up to 95% isolated yield through CuAAC click reactions. By this simple, high-yielding and quick method we

Synthesis of skeletally diverse alkaloid-like molecules: exploitation of metathesis substrates assembled from triplets of building blocks

• Sushil K. Maurya,
• Mark Dow,
• Stuart Warriner and
• Adam Nelson

Beilstein J. Org. Chem. 2013, 9, 775–785, doi:10.3762/bjoc.9.88

• with methyl chloroformate and DMAP. The allylic carbonate 15 underwent efficient asymmetric allylic amination [20] with o-nitrophenylsulfonamide as the nucleophile to give the allylic sulfonamide 17 in 66% yield; in addition, the linear product 16 was also obtained in 7% yield. Desilylation of 17 (→ 18

Organocatalytic asymmetric allylic amination of Morita–Baylis–Hillman carbonates of isatins

• Hang Zhang,
• Shan-Jun Zhang,
• Qing-Qing Zhou,
• Lin Dong and
• Ying-Chun Chen

Beilstein J. Org. Chem. 2012, 8, 1241–1245, doi:10.3762/bjoc.8.139

• investigation of a Lewis base catalyzed asymmetric allylic amination of Morita–Baylis–Hillman carbonates derived from isatins afforded an electrophilic pathway to access multifunctional oxindoles bearing a C3-quaternary stereocenter, provided with good to excellent enantioselectivity (up to 94% ee) and in high

• transformations of MBH carbonates of isatins are under way in our laboratory. Allylic amination of MBH carbonates of isatins to access 3-amino-2-oxindoles. Synthetic transformations of multifunctional product 4d. Screening studies of asymmetric allylic amination of MBH carbonate of isatin.a Substrate scope and