A versatile and efficient approach for the synthesis of chiral 1,3-nitroamines and 1,3-diamines via conjugate addition to new (<i>S</i>,<i>E</i>)-γ-aminated nitroalkenes derived from L-α-amino acids
作者:Vera Lúcia Patrocinio Pereira、André Luiz da Silva Moura、Daniel Pais Pires Vieira、Leandro Lara de Carvalho、Eliz Regina Bueno Torres、Jeronimo da Silva Costa
DOI:10.3762/bjoc.9.95
日期:——
New chiral (S,E)-gamma-N,N-dibenzylated nitroalkenes 2a-c were synthesized from natural L-(alpha)-amino acids in five steps with overall yields of 68-88%. The conjugate addition of hydride, methoxide, nitronate and azide nucleophiles to 2a-c led to the corresponding chiral 1,3-nitroamines in 74-90% yield. The conjugate addition of cyanide anion to 2a,b was followed by HNO2 elimination affording chiral
新的手性 (S,E)-γ-N,N-二苄基硝基烯烃 2a-c 是由天然 L-(α)-氨基酸分五步合成的,总产率为 68-88%。氢化物、甲醇盐、硝基酸盐和叠氮化物亲核试剂与 2a-c 的共轭加成以 74-90% 的产率得到相应的手性 1,3-硝基胺。将氰化物阴离子共轭加成到 2a,b,然后消除 HNO2,得到手性胺化丙烯腈 (73-98%)。另一方面,叠氮阴离子与乙腈中的 2a 反应,通过 [3 + 2]-环加成反应失去 HNO2,得到相应的 1,2,3-三唑衍生物。1,3-硝基胺衍生物9a、b的直接还原以良好的产率产生相应的1,3-二胺。