Iodocyclofunctionalization of (Z)-1-trichloroacetimidoyloxyalk-2-enes and 3-trichloroacetimidoyloxyalk-1-enes. Synthesis of (±)-erythro-sphinganine triacetate and (±)-threo-sphinganine triacetate
作者:Alessandro Bongini、Giuliana Cardillo、Mario Orena、Sergio Sandri、Claudia Tomasini
DOI:10.1039/p19860001339
日期:——
(Z)-1-Trichloroacetimidoyloxyoctadec-2-ene, easily obtained from (Z)-octadec-2-en-1-ol, was iodocyclized with N-iodosuccinimide to give the 4-(1-iodohexadecyl)-2-trichloromethyl-4,5-dihydro-oxazole. From this compound, two routes were developed, either to pure (±)-erythro-sphinganine triacetate or to pure (±)-threo-sphinganine triacetate, respectively. The neutral cleavage of 4-(1-iodohexadecyl)-2-trichloromethyl-4
从(Z)-十八烷基-2-烯-1-醇容易获得的(Z)-1-三氯乙二酰亚胺基氧基十八烷基-2-烯用N-碘代琥珀酰亚胺酰亚胺化,得到4-(1-碘十六烷基)-2-三氯甲基-。 4,5-二氢-恶唑。从该化合物中,两条路线被开发,无论是纯的(±) -赤型-sphinganine三乙酸酯纯或(±) -苏型分别-sphinganine三乙酸酯,。中性裂解4-(1-碘十六烷基)-2-三氯甲基-4,5-二氢-恶唑得到相应的酰胺,该酰胺通过用Amberlyst A 26(CO 3 2-形式)处理而得到顺式-4-羟甲基-5-十五烷基-2-三氯甲基-4,5-二氢-恶唑与少量顺式-2-羟甲基-3-十五烷基氮丙啶。恶唑水解并完全乙酰化后,以70%的收率获得(±)-赤型-鞘氨醇三乙酸酯。在另一方面中,4-(1- iodohexadecyl)的酸裂解恶唑2-氨基-3-碘-十八烷-1-醇盐酸盐,其直接用Amberlyst A