Reaction of α-(<i>N</i>-Carbamoyl)alkylcuprates with Propargyl Substrates: Synthetic Route to α-Amino Allenes and Δ<sup>3</sup>-Pyrrolines
作者:R. Karl Dieter、Ningyi Chen、Huayun Yu、Lois E. Nice、Vinayak K. Gore
DOI:10.1021/jo0481405
日期:2005.3.1
Carbamate deprotonation followed by treatment with CuCN·2LiCl affords α-(N-carbamoyl)alkylcuprates which react with propargyl halides, mesylates, tosylates, phosphates, acetates, and epoxides to give α-(N-carbamoyl) allenes via an anti-SN2‘ substitution process. Propargyl halides, sulfonates, and phosphates give good yields of carbamoyl allenes, while the acetates afford low yields. Propargyl substrates
氨基甲酸酯去质子化,然后用CuCN·2LiCl处理,得到α-(N-氨基甲酰基)烷基铜酸酯,它们与炔丙基卤,甲磺酸酯,甲苯磺酸酯,磷酸盐,乙酸酯和环氧化物反应,通过抗S N生成α-(N-氨基甲酰基)丙二烯。2'替代过程。炔丙基卤化物,磺酸盐和磷酸盐给出的氨基甲酰基烯丙基烯的收率高,而乙酸酯的收率低。炔丙基底物在没有严重空间位阻的情况下进行区域特异性S N 2'取代。α-(ñ -氨基甲酰基)丙二烯环化,可以-2-恶唑烷酮或脱保护,得到其可以被环化至Δ游离胺3个-pyrrolines与任一的AgNO 3或Ru3(CO)12。
Synthesis of amino allenes via reaction of α-aminoalkylcuprates with propargyl substrates
作者:R.Karl Dieter、Lois E Nice
DOI:10.1016/s0040-4039(99)00778-9
日期:1999.6
α-Aminoalkylcuprates prepared from carbamates via sequential deprotonation and treatment with CuCN·2LiCl react with propargyl bromides, mesylates, tosylates, acetates, and epoxides to afford amino allenesvia a SN2′ substitution process. Propargyl bromides and sulfonates give good yields of amino allenes while the acetates afford low yields. Substrates undergo regiospecific SN2′ substitution and the
由氨基甲酸酯经顺序去质子化制得的α-氨基烷基铜酸酯,并用CuCN·2LiCl处理,与炔丙基溴,甲磺酸酯,甲苯磺酸酯,乙酸酯和环氧化物反应,经S N 2'取代过程制得氨基丙二烯。炔丙基溴和磺酸盐提供了良好的氨基丙二烯收率,而乙酸酯提供了低收率。底物进行区域特异性S N 2'取代,使用Sc(OTf)3可提高炔丙基环氧化物的氨基丙二烯收率。Boc保护的α-氨基丙二烯可以环化为恶唑烷酮或脱保护得到游离胺。