An efficient non-catalytic, regioselective approach to the synthesis of angularly fused polycyclic systems
作者:Ramendra Pratap、Vishnu Ji Ram
DOI:10.1016/j.tetlet.2009.04.122
日期:2009.7
of 4-sec.amino-2-oxo-5,6-dihydro-2H-benzo[h]chromene-3-carbonitriles by a carbanion, generated in situ from cyclopentanone, cyclohexanone, cycloheptanone, and cyclooctanone separately in good yields. An increase in the size of cycloalkanone ring beyond cyclooctanone restricts the ring transformation under analogous reaction conditions possibly due to bulky conformation of higher homologs. The synthetic
秒合成PAH类似物部分还原的不同环尺寸的新颖方法。通过环戊酮原位生成的碳负离子,通过碱诱导的4 - sec .amino-2-oxo-5,6-dihydro-2 H-苯并[ h ]色烯-3-腈的环诱导的环氧基描述了氨基和腈的官能团,环己酮,环庚酮和环辛酮的收率很好。在类似的反应条件下,环烷酮环的尺寸增加到超过环辛酮会限制环的转化,这可能是由于较高的同系物的庞大构象所致。合成方法为构建有角稠合的部分还原的多环芳烃提供了一条有效的通用途径:5-秒 氨基-2,3,6,7-四氢-1 H-环戊[ c ]菲-4-腈,6秒。氨基-2,3,4,7,8-五氢-1 H-苯并[ c ]菲-5腈,7- sec。氨基-2,3,4,5,8,9-六氢-1 H-环庚[ c ]菲-6腈和8 sec。氨基-2,3,4,5,6,9,10-七氢-1 H-环辛基[ c ]菲-7腈。