Chalcone-Based Pyridinium Salts and Their Diastereoselective Dearomatization To Access Bibridged Benzoazepines
作者:Le-Le Wang、Hua-Bin Han、Zhao-Hui Cui、Jun-Wei Zhao、Zhan-Wei Bu、Qi-Lin Wang
DOI:10.1021/acs.orglett.9b04398
日期:2020.2.7
chalcone-based pyridiniumsalts have been successfully exploited, which could smoothly participate in the highly diastereoselective dearomatization with binucleophilic enaminones by taking advantage of their multiple reactive sites to construct bibridged benzoazepines in up to 89% yields. The key to the success was the skillful and unprecedented C-3 functionalization of the new pyridiniumsalts. This work
Cu catalyzed cross-dehydrogenative coupling reaction for the synthesis of 3-hydroxy-2-pyrrolidinones
作者:Rajib Sarkar、Chhanda Mukhopadhyay
DOI:10.1016/j.tetlet.2018.06.061
日期:2018.8
regioselective CC coupling has been developed. This is a Cu (II) catalyzed cross dehydrogenative coupling (CDC) involving enamino-ketones of benzyl amines and di-alkyl acetylenedicarboxylate, followed by cyclization by primary amines. TBHP (tert-butyl hydroperoxide) has been used as the oxidant to promote the coupling protocol. This synthetic route principally demonstrates the scope of CDC reaction and also
作者:Mara E. F. Braibante、Hugo T. S. Braibante、Giovanni B. Rosso、Juliano K. da Roza
DOI:10.1055/s-2001-17702
日期:——
A series of α-bromo 3-amino-5,5-dimethylcyclohex-2-en-1-ones 2a-g and α-bromo β-enamino compounds 4a, b have been conveniently prepared using NBS supported on montmorillonite (K-10). Other reaction conditions such as di-tert-butyl peroxide/NBS/CCl4, and Br2/CH2Cl2 were also studied for 3-amino-5,5-dimethylcyclohex-2-en-1-ones 1b, e, g resulting in a mixture of mono and di-brominated compounds 5b, f, g and 6b, e, g.