Diversity-oriented synthesis of 1,2,3,5-tetrahydrobenzo[e][1,2,4]oxadiazepines and 2,3-dihydro-1H-benzo[e][1,2,4]triazepines by base-induced [4 + 3] annulation reactions
作者:Wuyan Long、Shuangqun Chen、Xiaohong Zhang、Ling Fang、Zhiyong Wang
DOI:10.1016/j.tet.2018.09.004
日期:2018.10
The base-induced formal [4 + 3] annulation reactions of N-(ortho-chloromethyl)aryl amides with nitrones or hydrazonoyl chlorides have been reported. When nitrones are used as the 1,3-dipole, the corresponding reaction afforded a series of 1,2,3,5-tetrahydrobenzo[e][1,2,4]oxadiazepine derivatives. Highly functionalized 2,3-dihydro-1H-benzo[e][1,2,4]triazepine derivatives were also synthesized via an
已经报道了碱诱导的N-(邻氯甲基)芳基酰胺与硝酮或酰肼基氯化物的正式[4 + 3]环化反应。当将硝酮用作1,3-偶极时,相应的反应得到一系列1,2,3,5-四氢苯并[ e ] [1,2,4]恶二氮杂衍生物。还通过N-(邻-氯甲基)芳基酰胺和酰基之间空前的串联氮杂-迈克尔加成/重排芳构化反应合成了高度官能化的2,3-二氢-1 H-苯并[ e ] [1,2,4]三氮杂卓衍生物氯化物。
Construction of Optically Active Indolines by Formal [4+1] Annulation of Sulfur Ylides and<i>N</i>-(<i>ortho</i>-Chloromethyl)aryl Amides
Get asymmetric! Asymmetric [4+1] annulation of sulfur ylides and N‐(ortho‐chloromethyl)arylamides allowed the formation of the desired cycloadduct with moderate to high yields and enantioselectivities (see scheme). The described strategy, taking advantage of chiral sulfur ylides, represents a direct procedure to access chiral 2‐substituted indolines.
A tandem phospha‐Michael addition/N‐acylation/intramolecular Wittigreaction of in situ formed aza‐o‐QMs is disclosed. This approach features high functional group tolerance and provides a convenient and practical access to biologically significant indole derivatives (37 examples, up to 91% yield) under mild reaction conditions.