Nicholas Reactions in the Synthesis of Dicobalt Dibenzocyclooctyne Complexes
摘要:
Hexacarbonyldicobalt complexes of biaryl-substituted 4-methoxybutynones and 4-methoxy-2-butynes undergo intramolecular Nicholas reactions to form dibenzocyclooctyne-Co-2(CO)(6) complexes in good yields. Reductive decomplexation of the cyclization products is possible, and the method has been applied to a formal synthesis of isoschizandrin.
Heterobimetallic Pd–Sn Catalysis: A Suzuki, Tandem Ring-Closing Sequence toward Indeno[2,1-<i>b</i>]thiophenes and Indeno[2,1-<i>b</i>]indoles
作者:Debjit Das、Sanjay Pratihar、Sujit Roy
DOI:10.1021/ol3021995
日期:2012.9.21
Indeno[2,1-b]thiophene and indeno[1,2-b]indole motifs have been obtained in moderate to good yields from easily available substituted boronic acids, 2-bromo aryl/vinyl aldehydes, and nucleophiles such as arenes/heteroarenes and others using a catalytic combination of bimetallic “Pd–Sn” and AgPF6. This formal three-component coupling involves a Suzuki reaction followed by nucleophile assisted tandem
茚并[2,1- b ]噻吩和茚并[1,2- b ]吲哚基序已经在中度至良好的产率从容易获得的取代的硼酸获得,2-溴芳基/乙烯基醛,和亲核试剂如芳烃/杂芳烃其他使用双金属“ Pd-Sn”和AgPF 6的催化组合。正式的三组分偶联涉及Suzuki反应,然后亲核试剂协助串联闭环。还完成了取代杂环稠合的茚,苯并芴和芴的顺序合成。
Exploring the Reactivity of <i>N</i>-Alkynylated Sulfoximines: Acid-Catalyzed Cyclizations
作者:Ramona Pirwerdjan、Peter Becker、Carsten Bolm
DOI:10.1021/acs.orglett.6b01646
日期:2016.7.15
N-Alkynylated sulfoximines undergo acid-promoted cyclization processes under mild reaction conditions. The transformations proceed in short reaction times affording sulfoximidoyl-functionalized naphtho[2,1-b]thiophenes or pyrrolo[1,2-a]quinolines in up to excellent yields.
在温和的反应条件下,N-炔基化亚砜亚砜经历酸促进的环化过程。转化在较短的反应时间内进行,从而以极高的收率得到了磺酰亚胺基亚氨酰基官能化的萘并[2,1- b ]噻吩或吡咯并[1,2- a ]喹啉。
Modular Synthesis of Naphthothiophenes by Pd-Catalyzed Tandem Direct Arylation/Suzuki Coupling
作者:Norman Nicolaus、Patrick T. Franke、Mark Lautens
DOI:10.1021/ol201585a
日期:2011.8.19
A short and highly modular three-step synthesis of a new class of substituted naphthothiophenes has been developed exploiting a Pd-catalyzed tandem direct arylation/Suzukicoupling transformation as the key step.
Allocolchicines via Intramolecular Nicholas Reactions: The Synthesis of NSC 51046
作者:Sinisa Djurdjevic、James R. Green
DOI:10.1021/ol7024422
日期:2007.12.1
Biaryl propargyl acetate hexacarbonyldicobalt complexes (4) undergo Lewis acid mediated Nicholas reactions with a remote arene function to afford dibenzocycloheptyne complexes (9). Reductive decomplexation based on a hydrosilylation-protodesilylation protocol is facile, and the 1,2,3,9-tetramethoxy case can be converted to NSC 51046 ((S)-N-acetylcolchicinol methyl ether, 3).