Catalytically Enantioselective Synthesis of Acyclic α-Tertiary Amines through Desymmetrization of 2-Substituted 2-Nitro-1,3-diols
作者:Shan-Shui Meng、Wu-Bang Tang、Wen-Hua Zheng
DOI:10.1021/acs.orglett.7b03581
日期:2018.2.2
Highly enantioselective synthesis of acyclic α-tertiary amines through asymmetric desymmetrization is reported. This approach is based on chiral phosphoric acid mediated, enantioselective, oxidative desymmetrization of 2-substituted 2-nitro-1,3-diolbenzylidine acetals in the presence of DMDO as an oxidant. The method allows for the formation of a wide variety of chiral 2-nitro-1,3-diols in high enantioselectivity
Synthesis of Easy-to-Functionalize Azabicycloalkane Scaffolds as Dipeptide Turn Mimics en Route to cRGD-Based Bioconjugates
作者:Massimo Serra、Simone Maria Tambini、Marcello Di Giacomo、Elena Giulia Peviani、Laura Belvisi、Lino Colombo
DOI:10.1002/ejoc.201501003
日期:2015.12
In this paper we report the synthesis of new azabicycloalkane scaffolds, which could be exploited to obtain cRGD-based bioconjugates that may find promising application for targeted drug delivery, theranostic, and general cancer-cell labeling. By exploiting a Hosomi–Sakurai intramolecular allylation reaction we efficiently converted a silylated aldehyde precursor into 7,5-fused lactam scaffolds endowed
Lipase-Catalyzed Desymmetrization of Quaternary Carbon-Containing 1,3-Propanediols: A New Entry to the Asymmetric Synthesis of α-Substituted Serine Analogues
作者:Guo-Qiang Lin、Ping Tian、Ming-Hua Xu、Zhi-Qian Wang、Zu-Yi Li
DOI:10.1055/s-2006-939713
日期:——
A new approach to the asymmetric synthesis of α-substituted serine analogues was developed. The method utilizes a lipase-catalyzed esterification desymmetrization protocol. In the presence of PPL, a series of benzyl-substituted quaternary 2-nitropropane-1,3-diols were successfully desymmetrized by selective acetylation in very good yields and enantioselectivities (up to 95% ee).