Regioselectivity for intramolecularDiels–Alder (IMDA) reactions of 6-acetoxy-6-alkenylcyclohexa-2,4-dien-1-ones that were formed by oxidation of 2-alkenylphenols with lead tetraacetate in acetic acid were studied. Bridged regioselectivity was observed in the IMDA reactions of 6-acetoxy-6-alkenylcyclohexa-2,4-dien-1-ones having a dienophile part which could conjugate with an aromatic group. Bridged
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.
Enantioselective Palladium-Catalyzed Heck-Heck Cascade Reactions: Ready Access to the Tetracyclic Core of Lycorane Alkaloids
作者:Estibaliz Coya、Nuria Sotomayor、Esther Lete
DOI:10.1002/adsc.201500431
日期:2015.10.12
A rapid and efficient access to a wide variety of enantiomerically enriched C-11b substituted lycorane analogues can be achieved via a catalytic asymmetric Heck–Heck 6-exo/6-endo cascadereaction in the presence of (R)-BINAP.