Kinetic resolutions and kineticasymmetrictransformations (KAT) as well as dynamickinetic resolutions and dynamickineticasymmetrictransformations (DYKAT) are important synthetic protocols. The feasibility of KAT and DYKAT processes for asymmetric allylic alkylations (AAA) is explored utilizing a single substrate--conduritol B tetraesters. Both processes can be performed resulting in excellent
Enantioselective synthesis of α-nitro-δ-ketosulfones via a quinine–squaramide catalyzed conjugate addition of α-nitrosulfones to enones
作者:Kalisankar Bera、Irishi N. N. Namboothiri
DOI:10.1039/c3cc45985c
日期:——
Conjugate addition of α-nitrosulfones to vinyl ketones in the presence of 0.2 mol% of a quinineâsquaramide organocatalyst afforded α-nitro-δ-ketosulfones possessing a tetrasubstituted chiral center in excellent yield and enantioselectivity in most cases. This strategy also offers a facile and convenient entry into γ-sulfonylhydroxamates that are one carbon homologs of potent enzyme inhibitors.
Regio- and Chemoselective Double Allylic Substitution of Alkenyl vic-Diols
作者:Bocheng Chen、Lucas Pagès、Raphaël Dollet、Cyrille Kouklovsky、Sébastien Prévost、Aurélien de la Torre
DOI:10.1021/acs.orglett.4c00495
日期:2024.3.29
Double allylicsubstitution is an attractive approach to building molecular complexity from simple starting materials by creating two new bonds in one pot. However, this type of reaction has been doomed by chemoselectivity and regioselectivity issues. In this letter, we describe a new approach to introduce a-la-carte two new C–C, C–N, C–O, or C–S bonds in a chemo- and regioselective fashion. The reaction