The preparation of eighteen epoxy diazomethyl ketones 1 is described. Two general methods were developed. Firstly, treatment of the mixed anhydrides of glycidic acids and carbonic acid ester with diazomethane led to the title compounds in yields ranging from 17–74%. Secondly, glycidyl chlorides which were obtained from sodium glycidates and oxalyl chloride, gave the desired products upon treatment
Reaction of pyran-2-thiones 4 with nitrosoderivatives led surprisingly to type-8 (19) adducts which proved to be isomeric with the initially expected primary Diels-Alder cycloadducts 5. Methyl 2-thioxo-2H-pyran-5-carboxylate (4f), when reacted with nitrosobenzene at -10°, led quantitatively to the thieto-oxazine intermediate 13, which turned out to be the cornerstone of the complex cycloaddition-rearrangement
吡喃-2-硫酮的反应4与导致令人惊奇的亚硝基衍生物型- 8(19被证明是同分异构体与最初的预期主要)加合物狄尔斯-阿尔德cycloadducts 5。当在-10°下与亚硝基苯反应时,2-thioxo-2 H -pyran-5-羧酸甲酯(4f)定量地导致硫代恶嗪中间体13转化为复杂的环加成重排5 的基石。8个反应途径(方案3)。差示扫描量热法,与18a 19a相同转化,被允许证明该多步重排总体上是高温放热过程,最终产物19代表沿着该反应路径的能量吸收器。
Synthesis of enantiomerically pure forms of trans-3-phenylglycidic acid
Trans-(2R,3S)- and (2S,3R)-3-phenylglycidic acids were obtained as pure crystals. The optical properties and chemical stability were characterized. The absolute configuration of the trans-(+)- and trans-(−) isomers was established by means of chemical correlation.
Zur Aminolyse von trans-3-Phenylglycidsäure-Derivaten, 5. Mitt. Unterscheidung N-substituierter 3-Phenylserin- und 3-Phenylisoserin-Derivate
作者:J. Wilhelm Tack、Jochen Lehmann、Felix Zymalkowski
DOI:10.1002/ardp.19793120211
日期:——
Aminolysen von trans‐3‐Phenylglycidsäure‐Derivaten mit primären und sekundären aliphatischen Aminen führen zu Derivatendes erythro‐3‐Phenylisoserins. Den einzig zuverlässigen chemischen Strukturbeweis sehen wir in der Hydrogenolyse der Benzyl‐N‐Gruppierung bei 3‐Phenylisoserinen bzw. der Benzyl‐O‐Gruppierung bei 3‐Phenylserinen. Das Ergebnis des unter5) mitgeteilten Strukturbeweises ist falsch.
反式 3- 苯基缩水甘油酸衍生物与脂肪族伯胺和仲胺的氨解生成赤型 3- 苯基异丝氨酸衍生物。我们在 3-苯基异丝氨酸中的苄基 N 基团和 3-苯基丝氨酸中的苄基 O 基团的氢解中看到了唯一可靠的化学结构证据。5)下给出的结构证明的结果是错误的。
Gadaj; Kowalkowska; Jonczyk, Polish Journal of Chemistry, 2008, vol. 82, # 3, p. 577 - 584