Synthesis of novel halogenated 2-vinylchroman-4-ones and their antimicrobial activity
摘要:
Novel halogenated 2-vinylchromanones were prepared which show a strong growth inhibition toward Gram-negative bacteria. The activity pattern is different to previously reported derivatives and depends on the position of the halogen substituent.
DTBP-promoted site-selective α-alkoxyl C–H functionalization of alkyl esters: synthesis of 2-alkyl ester substituted chromanones
作者:Jin-Tao Yu、Yiting Li、Rongzhen Chen、Zixian Yang、Changduo Pan
DOI:10.1039/d1ob00605c
日期:——
The direct C–H functionalization of ethylacetates was developed, delivering a variety of 1-(4-oxochroman-2-yl)ethylacetate derivatives by reacting with chromones. This reaction has a wide substrate scope with excellent site-selective C–H activation at the inactive α-hydrogen of the alkoxyl group instead of the α-hydrogen of the carbonyl group under radical conditions. Compared with other protocols