Synthesis of new C<sub>2</sub>symmetrical dibenzospirodiamide and dibenzospirodiamine as potential chiral auxiliaries and building blocks of ionophores
作者:Heung-Jin Choi、Yang Jin Park、Moon Goo Kim、Yeon Sil Park
DOI:10.1002/jhet.5570370547
日期:2000.9
2,8-Diazadibenzo[c,i]spiro[5,5]undecan-1,7-dione 3 are synthesized via reaction of malonic ester with 2-nitrobenzyl bromide, followed by reduction-cyclization in 86% overall yield. 2,8-Diazadibenzo[c,i]-spiro[5,5]undecane 4 was obtained by reduction of 3 with LiAIH4 in 90% yield. N-Alkylation of 3 with various alkylating reagents is studied.
通过丙二酸酯与2-硝基苄基溴的反应,然后还原环化以86%的总收率合成2,8-二氮杂二苯并[ c,i ]螺基[5,5] undecan-1,7-二酮3。通过用LiAlH 4还原3,以90%的产率获得2,8-二氮二苯并[ c,i ]-螺[5,5]十一烷4。研究了各种烷基化试剂对3的N-烷基化反应。