4-Isopropyl-2-oxazolin-5-one anion as masked umpoled synthon for both formyl and hydroxycarbonyl anions: Generation, reactivity and synthetic applications
作者:Achille Barco、Simonetta Benetti、Carmela De Risi、Gian P Pollini、Giampiero Spalluto、Vinicio Zanirato
DOI:10.1016/0040-4020(96)00143-3
日期:1996.3
formaldehyde. On the other hand, the same anion of 1 may act as a masked umpoled synthon for a hydroxycarbonyl anion since its aldol adducts with aldehydes underwent concomitant isomerization and ring cleavage under mild basic conditions producing dipeptides which could be hydrolyzed to give the corresponding carboxylic acids. Synthetic applications of this chemistry in the area of sugar, aminosugar and non-proteinogenic
标题化合物的阴离子是在催化量的三乙胺存在下简单产生的,它与常见的亲电子烯烃和醛反应,分别得到中等或良好的迈克尔或醛醇加合物收率。在室温下对这些加合物进行轻度酸处理可掩盖醛的功能,使人们可以将1的阴离子视为甲醛的亲核酰化当量。另一方面,相同的阴离子1可以用作羟羰基阴离子的掩蔽的缩聚的合成酮,因为它的醛与醛的加合物在温和的碱性条件下进行异构化和开环裂解,生成二肽,可以水解得到相应的羧酸。讨论了该化学方法在糖,氨基糖和非蛋白氨基酸衍生物领域中的合成应用。