Intramolecular hydroalkoxylation catalyzed inside a self-assembled cavity of an enzyme-like host structure
作者:L. Catti、K. Tiefenbacher
DOI:10.1039/c4cc08211g
日期:——
Self-assembled resorcin[4]arene hexamer catalyzes the intramolecular hydroalkoxylation of unsaturated alcohols to the corresponding cyclic ethers under mild conditions.
自组装的间苯二酚[4]芳烃六聚体在温和条件下催化不饱和醇的分子内氢氧烷基化反应,生成相应的环醚。
Highly Stereoselective Cationic Cyclization Assisted by a Sulfenyl Group. Scope, Limitation, and Mechanism
When 8-acetoxy-2-methyl-9-(phenylthio)-2-nonene (1a) was treated with an acid, followed by a base, alkylative cyclization proceeded to give a mixture of 1,2-disubstituted cyclohexanes: 2a, 3a, and 4a. The stereochemistry of the reaction was only slightly affected by the leaving group and the reaction conditions, such as the temperature, solvent, and acid. However, the bulkiness of the sulfenyl group
Readily available 1,2-amino alcohols provide the framework for a new generation of chiral carboxylicacid catalysts that rival the acidity of the widely used chiral phosphoric acid catalyst (S)-TRIP. Covalently linked thiourea sites stabilize the carboxylate conjugate bases of these catalysts via anion-binding, an interaction that is largely responsible for the low pKa values. The utility of the new
The aim of this research was to discover α2-receptor antagonist subtypes that are more selective than known compounds. We focused on rigid molecules possessing a benzo-fused bicyclo[3.2.0]heptane skeleton. The synthetic route used relied upon the intramolecular [2+2] cycloaddition of styrylketene precursors. The cycloaddition was remarkably efficient and delivered multigram quantities of the cycloadduct