A dynamic kinetic resolution process was applied to an enantioconvergent microbial Baeyer–Villiger oxidation of benzyloxycyclopentanone, rac-1. This was achieved by combining a whole cell-based kinetic resolution and an anion exchange resin-catalysed in situ racemisation. Several resins were screened according to their capacity to catalyse the racemisation of 1. As compared to our previous results
The reaction of alkynyl phenyl selenides with p-toluene-sulfonic acid gives rise to a proton-induced ring-closure reaction affording γ- and 5-lactones.
炔基苯基硒化物与对甲苯磺酸的反应引起质子诱导的闭环反应,得到 γ-和 5-内酯。
The Effect of Electrostatic Interactions on Conformational Equilibria of Multiply Substituted Tetrahydropyran Oxocarbenium Ions
作者:Michael T. Yang、K. A. Woerpel
DOI:10.1021/jo8017846
日期:2009.1.16
the conformational preference of the C-5 alkoxymethyl group. Although the monosubstituted C-5 alkoxymethyl substituent preferred a pseudoequatorial orientation, the C-5−C-6 bond rotation was controlled by an electrostatic effect. The preferred diaxial conformer of the trans-4,5-disubstituted tetrahydropyranyl system underscored the importance of electrostatic effects in dictating conformational equilibria
A Concise and Efficient Synthesis of Spiroketals - Application to the Synthesis of SPIKET-P and a Spiroketal from<i>Bactrocera</i>Species
作者:Loic Tomas、Benjamin Bourdon、Jean Claude Caille、David Gueyrard、Peter G. Goekjian
DOI:10.1002/ejoc.201201199
日期:2013.2
We report the synthesis of spiroketals by sequence of enolethersynthesis and cyclization. The enolethers were prepared from lactones by a Julia olefination reaction, and the starting chiral lactone was prepared from an industrial intermediate. This route is a concise and efficient way to synthesize naturally occurring and biologically interesting spiroketals. We used this sequence for the preparation
我们通过烯醇醚合成和环化的顺序报告了螺缩酮的合成。烯醇醚由内酯通过 Julia 烯化反应制备,起始手性内酯由工业中间体制备。该路线是合成天然存在且具有生物学意义的螺旋酮的简洁有效的方法。我们使用这个序列来制备 SPIKET-P 和来自 Bactrocera 物种的 spiroketal。