Synthesis of optically active 6-amino-2-cycloheptenone as a convenient chiral building block for the preparation of 6-alkyl-2-cycloheptenone
作者:Masakazu Koiwa、Georges P-J. Hareau、Daisuke Morizono、Fumie Sato
DOI:10.1016/s0040-4039(99)00711-x
日期:1999.5
Optically active 6-amino-2-cycloheptenone 5 has been prepared from ethyl 2(E),6-heptadienoate where the Michael addition of a chiral amine, Ti(II)-mediated intramolecular nucleophilic acyl substitution reaction and FeCl3-mediated ring expansion are the key steps. The compound 5 undergoes highly diastereoselective conjugate addition of a Grignard reagent in the presence of a catalytic amount of Li2Cu(CN)Cl2
由2(E),6-庚二烯酸乙酯制备旋光的6-氨基-2-环庚酮5,其中手性胺的迈克尔加成,Ti(II)介导的分子内亲核酰基取代反应和FeCl 3介导的扩环是关键步骤。在催化量的Li 2 Cu(CN)Cl 2存在下,化合物5经历格氏试剂的高度非对映选择性共轭加成,以提供相应的顺式加合物,其随后转化为6-烷基取代的2-通过用治疗cycloheptenones p -tsa。