已经发现,在5mol%的碘化亚铜(I)存在下,格氏试剂可将磺酰基活化的sp 3碳-氮键裂解。重要的是,广泛的磺酰基活化的苄基,烯丙基和炔丙基胺与格利雅试剂进行平滑的交叉偶联反应,从而提供结构多样的偶联产物,收率高至优异,并具有较高的化学,区域和立体选择性。此外,已经证明S N 2机理参与交叉偶联反应,该交叉偶联反应允许由旋光的α-支化胺衍生物不对称地合成手性烃。
Base-promoted selective β-fragmentation of homoallylamines
摘要:
A selective beta-fragmentation of homoallylamines with the combination of iodobenzene diacetate, iodine, and sodium acetate is reported. The desired carbon-carbon bond cleavage proceeded via a radical beta-scission pathway under mild conditions with good functional group tolerance. (C) 2010 Elsevier Ltd. All rights reserved.
Organocatalytic Enantioselective Synthesis of α-Fluoro-β-amino Acid Derivatives
作者:Matthew R. Straub、Vladimir B. Birman
DOI:10.1021/acs.orglett.8b03297
日期:2018.12.7
catalyst HBTM-2 generates 3-fluoro-β-lactams with high enantio- and diastereoselectivity. These reactive compounds are opened with alcohols or amines to produce the corresponding α-fluoro-β-amino acid derivatives in moderate yields.
generation of amines by palladium-catalyzed nucleophilic benzylic addition of 2-methyl-substituted azaarenes to N-sulfonyl aldimines under neutral conditions via C-H bondactivation has been developed. This reaction represents a very efficient methodology for the synthesis of heterocycle-containing amines and thus opens a new way to access amines through C-H bondactivation.
Iron-Catalyzed Direct Alkenylation of 2-Substituted Azaarenes with <i>N</i>-Sulfonyl Aldimines via C–H Bond Activation
作者:Bo Qian、Pan Xie、Yinjun Xie、Hanmin Huang
DOI:10.1021/ol200684b
日期:2011.5.20
A novel iron-catalyzed alkenylation of 2-substituted azaarenes through sp3 C–Hbondactivation has been developed. A favorable E2-elimination is proposed as a key step to cleavage of C–H and C–N bonds for the construction of a C═C bond in high stereoselectivity. This transformation represents an efficient way to synthesize 2-alkenylated azaarenes from simple starting materials.
Aza-Morita–Baylis–Hillman reactions catalyzed by a cyclopropenylidene
作者:Xun Lu、Uwe Schneider
DOI:10.1039/c6cc06201f
日期:——
Catalysis using a bis(dialkylamino)cyclopropenylidene (BAC) has been developed, which relies on a formal umpolung activation of Michael acceptor pro-nucleophiles.
α-Aryl-Substituted Allenamides in an Imino-Nazarov Cyclization Cascade Catalyzed by Au(I)
作者:Zhi-Xiong Ma、Shuzhong He、Wangze Song、Richard P. Hsung
DOI:10.1021/ol302743k
日期:2012.11.16
An imino-Nazarovcyclization using α-aryl-substituted allenamides is described. This gold(I)-catalyzed cascade is efficient and regioselective in constructing a diverse array of synthetically useful aromatic-ring fused cyclopentenamides. The success in this transformation represents a solution to the challenge in establishing an imino-Nazarovcyclizationprocess.