The synthetically important 2-alkenylchromane derivatives were constructed in good yields under metal-free condition via inverse electron demand Hetero-Diels–Alder reaction of o-quinonemethides with unactivated dienes. This strategy features mild condition, good diastereoselectivity and wide substrate scope.
Amino-substituted flavans useful as anti-viral agents
申请人:——
公开号:US04461907A1
公开(公告)日:1984-07-24
Novel compounds of formula (IID) ##STR1## wherein either both X and Y represent groups independently selected from amino and lower alkylamino, or one of X and Y represents a group selected from amino and lower alkylamino and the other of X and Y represents a hydrogen atom have been found to be active against rhinoviruses and other viruses. Processes for producing these compounds include reduction of flavanone derivatives or of flavenes. Alternatively, reductive cyclization of chalcones affords the compounds. These may also be prepared by condensation of o-(substituted methyl)phenols with styrene derivatives. Pharmaceutical formulations and methods for the administration of the compounds are described.
One-Pot Synthesis of O-Heterocycles or Aryl Ketones Using an InCl<sub>3</sub>/Et<sub>3</sub>SiH System by Switching the Solvent
作者:Wenqiang Jia、Qiumu Xi、Tianqi Liu、Minjian Yang、Yonghui Chen、Dali Yin、Xiaojian Wang
DOI:10.1021/acs.joc.9b00140
日期:2019.5.3
An efficient one-pot synthesis of O-heterocycles or aryl ketones has been achieved using Et3SiH in the presence of InCl3 via a sequential ionic hydrogenation reaction by switching the solvent. This methodology can be used to construct C–O bonds and to prepare conjugate reduction products, including chromans, tetrahydrofurans, tetrahydropyrans, dihydroisobenzofurans, dihydrochalcones, and 1,4-diones
An efficient synthesis of flavans from salicylaldehyde and acetophenone derivatives
作者:Ofentse Mazimba、Ishmael B. Masesane、Runner R. Majinda
DOI:10.1016/j.tetlet.2011.09.147
日期:2011.12
An efficient total synthesis of flavans from the reactions of salicylaldehyde and acetophenonederivatives is reported. The synthesis involves preparation of chalcones through an aldol reaction followed by reduction of both the double bond and the ketone using NaBH4 and an acetic acid mediated cyclization. Methoxy groups on the aromatic rings did not affect significantly the yields of the procedure
Novel intermediates and process for their preparation
申请人:THE WELLCOME FOUNDATION LIMITED
公开号:EP0051061A2
公开(公告)日:1982-05-05
Known and novel compounds of formula (I), wherein R, and R2 represent
substituents selected from halogen atoms and nitro, cyano, trifluoromethyl, lower alkyl, lower alkoxyl, amino and hydroxyl groups are active against viruses, especially rhinoviruses. Methods for producing the compounds are described, as are pharmaceutical formulations and methods for administering the compounds to cure or prevent rhinoviral infections.
已知的和新型的式 (I) 化合物,其中 R 和 R2 代表选自卤素原子和硝基、氰基、三氟甲基、低级烷基、低级烷氧基、氨基和羟基的取代基,对病毒,特别是鼻病毒具有活性。 描述了生产这些化合物的方法,以及使用这些化合物治疗或预防鼻病毒感染的药物制剂和方法。