145416-06-4Relevant articles and documents
Total Synthesis of (-)-Daphnezomines A and B
Li, Chao,Li, Luyang,Lu, Yunan,Wu, Jinbao,Xu, Guangpeng
supporting information, p. 15240 - 15245 (2020/10/20)
Daphnezomines A and B are structurally unusual Daphniphyllum alkaloids that contain a unique aza-adamantane core skeleton. Herein, a modular approach to these alkaloids is presented that exploits a diverse array of reaction strategies. Commencing from a chiral pool terpene-(S)-carvone, the azabicyclo[3.3.1]nonane backbone, which occurs widely in Daphniphyllum alkaloids, was easily accessed through a Sharpless allylic amination and a palladium-catalyzed oxidative cyclization. A protecting group enabled a stereoselective B-alkyl Suzuki-Miyaura coupling sequence and an Fe-mediated hydrogen atom transfer (HAT)-based radical cyclization were then applied to construct C6 and C8 stereocenters. A final epimer locking strategy enabled the assembly of the highly congested aza-adamantane core, thereby achieving the first total synthesis of (-)-daphnezomines A and B in 14 steps.
Stereospecificity of the Au(I)-catalyzed reaction of 1-alkynyl-bicyclo[4.1. 0]-heptan-2-ones with nucleophiles
Labsch, Stephan,Ye, Shute,Adler, Andreas,Neudoerfl, Joerg-Martin,Schmalz, Hans-Guenther
scheme or table, p. 1745 - 1751 (2010/10/03)
The stereospecificity of the Au(I)-catalyzed reaction of 1-alkynyl-bicyclo[4.1.0]-heptan-2-ones with nucleophiles was investigated. The substrates were prepared in non-racemic form (up to 88% ee) through parallel kinetic resolution (CBS reduction) and reo
Highly enantioselective and regioselective carbonyl reduction of cyclic α,β-unsaturated ketones using TarB-N02 and sodium borohydride
Kim, Jinsoo,Bruning, John,Park, Kevin E.,Lee, David J.,Singaram, Bakthan
supporting information; experimental part, p. 4358 - 4361 (2009/12/24)
Asymmetric 1,2-reduction of α,β-unsaturated ketones using TarB-NO2 and NaBH4 Is reported. Simple cycloalkenones give products In low enantiomeric excess. However, cycloalkenones with a-substituents, such as halides, alkyl, and aryl, have been enantioselectively reduced with this system to yield chiral allylic alcohols In enantiomeric excess up to 99%. The starting materials for TarB-N02 are inexpensive, and the boronlc acid can be easily recovered In high yield by a simple acid extraction.