[1+1+3] Annulation of Diazoenals and Vinyl Azides: Direct Synthesis of Functionalized 1‐Pyrrolines through Olefination
作者:Vinaykumar Kanchupalli、Sreenivas Katukojvala
DOI:10.1002/anie.201801976
日期:2018.5.4
A dirhodium carboxylate catalyzed [1+1+3] annulation reaction of diazoenals and vinyl azides that gives synthetically important enal‐functionalized 1‐pyrroline derivatives was developed. The reaction involves a novel rhodium‐catalyzed olefination of diazoenals with vinyl azides via electrophilic enal carbenoids, resulting in a new class of enal acrylates. The annulation reaction was used for the direct
Synthesis of Amides and Nitriles from Vinyl Azides and <i>p</i>-Quinone Methides
作者:Chen Lin、Yangyong Shen、Bo Huang、Yu Liu、Sunliang Cui
DOI:10.1021/acs.joc.7b00145
日期:2017.4.7
A divergent synthesis of amides and nitrilesfrom vinyl azides and p-quinone methides (p-QMs) was developed. The p-QMs could be activated by BF3-Et2O and then nucleophilically attacked by vinyl azides, leading to divergent rearrangement toward amides and nitriles.
Diversity in Gold-Catalyzed Formal Cycloadditions of Ynamides with Azidoalkenes or 2<i>H</i>-Azirines: [3+2] versus [4+3] Cycloadditions
作者:Samir Kundlik Pawar、Rajkumar Lalji Sahani、Rai-Shung Liu
DOI:10.1002/chem.201500694
日期:2015.7.20
Gold‐catalyzed cycloadditions of ynamides with azidoalkenes or 2H‐azirines give [3+2] or [4+3] formal cycloadducts of three classes. Cycloadditions of ynamides with 2H‐azirine species afford pyrrole products with two regioselectivities when the Cβ‐substituted 2H‐azirine is replaced from an alkyl (or hydrogen) with an ester group. For ynamides substituted with an electron‐rich phenyl group, their reactions
Transformation of Alkynes into α- or β-Difluorinated Alkyl Azides by an Efficient One-Pot Two-Step Procedure
作者:Huaizhi Li、Bhoomireddy Rajendra Prasad Reddy、Xihe Bi
DOI:10.1021/acs.orglett.9b03593
日期:2019.12.6
herein an unprecedented 1,2-azide migratory hydroazidation and subsequent gem-difluorination of alkynes accessing β-difluorinated alkylazides. Importantly, functional group controlled 1,2-azide or 1,2-aryl migration was observed in the case of aromatic alkynes. Moreover, the azide group is sustained up to the final product. The method can be easily adapted for large-scale preparation, and the resulting