Influence of bulky substituents on the regioselective group-transfer reactions of diorganozinc compounds with N, N′-bis(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene
作者:Elmo Wissing、Klaas van Gorp、Jaap Boersma、Gerard van Koten
DOI:10.1016/0020-1693(94)03854-6
日期:1994.6
Abstract Diorganozinc compounds R 2 Zn (R=alkyl or aryl) react with N,N ′-bis(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene, (i-Pr 2 Ph)NCHCHpN(i-Pr 2 Ph) (i-Pr 2 Ph-DAB) to give thermally unstable 1:1 coordination complexes R 2 Zn(i-Pr2Ph-DAB), which subsequently undergo a slow regioselective alkyl or aryl group-transfer reaction from the zinc atom to an imine-nitrogen or a carbon atom of the
摘要二有机锌化合物R 2 Zn(R =烷基或芳基)与N,N'-双(2,6-二异丙基苯基)-1,4-二氮杂-1,3-丁二烯(i-Pr 2 Ph)反应NCHCHpN(i-Pr 2 Ph)(i-Pr 2 Ph-DAB)产生热不稳定的1:1配位化合物R 2 Zn(i-Pr2Ph-DAB),随后经历慢的区域选择性烷基或芳基i-Pr 2 Ph-DAB配体的锌原子到亚胺基氮或碳原子的NCCN系统的基团转移反应。在R =甲基,正丙基,正丁基,仲丁基,新戊基和苄基的情况下,发生C-烷基化,随后在氨基亚氨基骨架中发生1,2-氢转移,得到RZn [(i-Pr 2 Ph)N-CH 2-CRN(i-Pr 2 Ph)],而对于R =叔丁基,C烷基化产物t-BuZn [(i-Pr 2 Ph)NCH(t-Bu) )CHN(i-Pr 2 Ph)]是稳定的。出奇,