在此,我们报告Cp * Co III催化的C H活化方法是创建高度有价值的异喹诺酮和吡啶酮的重要步骤,这些异喹啉酮和吡啶酮可以轻松地用于各种芳香族素,原小ber碱和tylophora生物碱的总合成。这种特殊的CH活化/环化反应是通过多个末端以及内部炔烃偶联伙伴实现的,具有广泛的应用范围和出色的官能团耐受性。本文报道的该方案的合成适用性已在两个Topo-I-抑制剂和两个8-氧代小ber碱核心的合成中得到了证明,这些核心可进一步制成四氢小ber碱和原小ber碱生物碱。此外,这些构件也以方便的方式转化为六种不同的tylophora生物碱。
Unified Synthesis of Polycyclic Alkaloids by Complementary Carbonyl Activation**
作者:Guoli He、Benjamin List、Mathias Christmann
DOI:10.1002/anie.202102518
日期:2021.6.7
A complementary dual carbonyl activation strategy for the synthesis of polycyclic alkaloids has been developed. Successful applications include the synthesis of tetracyclic alkaloids harmalanine and harmalacinine, pentacyclic indoloquinolizidine alkaloid nortetoyobyrine, and octacyclic β-carboline alkaloid peganumine A. The latter synthesis features a protecting-group-free assembly and an asymmetric
已经开发出用于合成多环生物碱的互补双羰基活化策略。成功的应用包括四环生物碱骆驼蓬菌素和骆驼蓬菌素、五环吲哚喹啉西啶生物碱去甲代拜林和八环β-咔啉生物碱peganumine A的合成。后者的合成具有无保护基组装和不对称二磺酰亚胺催化环化的特点。此外,还实现了 hirsutine、deplancheine、10-desbromoarborescidine A 和 oxindole 生物碱钩藤碱和异钩藤碱的正式合成。最终完成了小檗碱生物碱ilicifoline B的简捷合成。
Palladium catalysed tandem cyclisation-anion capture processes. Part 1. Background and hydride ion capture by alkyl- and π-allyl-palladium species.
A new, wide ranging, synthetically powerful, catalytic tandem cyclisation-anion capture process is proposed which depends on the rate of cyclisation of an organopalladium specifies (RPdX) onto a proximate alkene or diene being significantly faster than anion exchange and reductive elimination in the sequence RPdX → RPdY → RY + Pd(0). The catalytic cyclisation - anion capture sequence is illustrated
Construction of a Protoberberine Alkaloid Skeleton via the Palladium-Catalyzed α-Arylation–Amide Formation Cascade
作者:Shaofeng Li、Hanyu Nie、Mengyan Duan、Wenfei Wang、Congjun Zhu、Chuanjun Song
DOI:10.1021/acs.orglett.1c03871
日期:2021.12.17
strategy of one-pot synthesis of protoberberine alkaloid derivativesvia palladium-catalyzed cascade α-arylation and cyclization, which can afford the target molecules in moderate to excellent isolated yields using commercially available raw materials under solvent-free conditions. This protocol provides an efficient and convenient path to multisubstituted protoberberine derivatives. In addition, it can
Protoberberines from Reissert-Compounds VIII [1]. Oxazoloisoquinolines, New and Efficient Educts for the Synthesis of 8-Oxoprotoberberines
作者:Eberhard Reimann、Fritz Grasberger、Kurt Polborn
DOI:10.1007/s00706-003-0013-5
日期:2003.6
Certain benzylated oxazoloisoquinolinones readily available fromReissert compounds provided an efficient access to 8-oxoprotoberberines in three steps. A series of these new precursors as well as several oxoprotoberberines were prepared and the scope and limitation of this procedure were investigated.
The invention provides a compound of formula (I), or a salt or prodrug thereof, wherein R1, R4-R8, R10, R2'-R6', W, and A have any of the values described in the specification, as well as compositions comprising a compound of formula (I). The compounds are useful as antibacterial agents.