已经开发了一条以四元中心在C-10上的吡咯并[1,2- b ]异喹啉的收敛途径,这意味着先后顺序是Pd(0)催化的碳钯反应,然后与硼酸进行交叉偶联反应。选择了适当的催化体系和实验条件,可以选择使用或不使用膦配体来控制该过程的化学选择性,从而使6-exo-carbopalladation生成四元中心并避免直接的Suzuki偶联。可以使用多种富电子和缺电子的芳基硼酸,以中等至良好的产率(最高94%,22个例子)为取代的吡咯并[1,2- b ]异喹啉提供有效的途径。
Metalation–cyclisation sequence on N-(o-halobenzyl)pyrroles. Synthesis of pyrrolo[1,2-b]isoquinolones
作者:Ainhoa Ardeo、Esther Lete、Nuria Sotomayor
DOI:10.1016/s0040-4039(00)00817-0
日期:2000.7
Parham-type cyclisation of N-(o-halobenzyl)pyrroles has been investigated. Aryllithiums generated from metalation of N-(o-iodobenzyl)pyrroles undergo intramolecular cyclisation to give pyrrolo[1,2-b]isoquinolinones in moderate to good yields, if the N,N-diethylcarbamoyl group is used as internal electrophile and the aromatic ring is activated.
已经研究了N-(邻卤代苄基)吡咯的Parham型环化。如果将N,N-二乙基氨基甲酰基用作内部亲电试剂和芳环,则由N-(邻碘苄基)吡咯金属化生成的芳基锂分子内环化,可以中等至良好的产率得到吡咯并[1,2- b ]异喹啉酮被激活。
An efficient entry to pyrrolo[1,2-b]isoquinolines and related systems through Parham cyclisation
作者:Javier Ruiz、Ainhoa Ardeo、Roberto Ignacio、Nuria Sotomayor、Esther Lete
DOI:10.1016/j.tet.2004.10.105
日期:2005.3
Aryllithiums generated by lithium-iodine exchange undergo intramolecular cyclisation to give pyrrolo[1,2-b]isoquinolines, in high yields. The best results were obtained when Weinreb or morpholine amides were used as internal electrophiles. The procedure has been extended to the preparation of seven and eight membered rings, opening a route to benzazepine and benzazocine skeletons. (c) 2004 Elsevier Ltd. All rights reserved.
Parham-Type Cycliacylation with Weinreb Amides. Application to the Synthesis of Fused Indolizinone Systems
作者:Javier Ruiz、Nuria Sotomayor、Esther Lete
DOI:10.1021/ol034194+
日期:2003.4.1
[GRAPHIC]Weinreb amides behave as efficient internal electrophiles in Parham-type cycliacylation reactions. Thus, aryl- and heteroaryllithiums generated by lithium-halogen exchange undergo intramolecular cyclization to give fused indolizinone systems as pyrrolo[1,2-b]isoquinolines, thieno[2,3-f]indolizinones, and pyrrolo[1,2-b]acridinones in high yields.