1,3-Dipolar cycloadditions of ethoxycarbonyl-nitrile benzylimine, EtOOC C N+ − N− CH2C6H5, and synthesis of β-amino acids. Synthesis and reactions of ethyl 2-chloro-2-ethoxyacetate and 2-chloro-2-ethoxyacetyl chloride
作者:Karen K. Bach、Hesham R. El-Seedi、Henrik M. Jensen、Helene B. Nielsen、Ib Thomsen、Kurt B.G. Torssell
DOI:10.1016/s0040-4020(01)90482-x
日期:——
syntheses of the title reagents were described. Ethyl 2-chloro-2-ethoxy-acetate gave selectively oximes, hydrazones, nitrones, and phosphonium salts with hydroxylamine, hydrazines, -substituted hydroxylamines and triphenylphosphine respectively. The phosphonium salt was used in a Wittig reaction with aldehydes to give α-ketoesters. Treatment of the acid chloride with allyl alcohols and subsequently with
烯烃的1,2-氰基-羟基化的原理被用于制备1,2-氰基-胺。该环加成反应的偶极组分是腈亚胺,其与烯烃形成吡唑啉。通过3-羧基吡唑啉的热解来完成环裂解,其产生1,2-氰基胺,随后的水解得到β-氨基酸。描述了标题试剂的合成。2-氯-2-乙氧基乙酸乙酯可选择性地生成肟,selectively,硝酮和phospho盐与羟胺,肼,-取代的羟胺和三苯基膦。salt盐用于与醛的维蒂希反应中,得到α-酮酸酯。用烯丙醇和随后用单取代的羟胺处理酰氯得到烯丙基酯硝酮,将其进行分子内环化。类似地,用烯丙基酯-氧化腈和烯丙基食用-腈亚胺体系进行分子内环化。