Synthetic studies toward the PPAP natural products, prolifenones A and B and hyperforin: an Effenberger cyclization approach
摘要:
A synthetic approach toward the geranylated PPAP natural products, prolifenones A and B. employing Effenberger cyclization as the key step, is delineated. The efficacy of this approach is further expanded through access to an advanced precursor of hyperforin. (C) 2010 Elsevier Ltd. All rights reserved.
Production of high molecular weight unsaturated ketones
申请人:BASF Aktiengesellschaft
公开号:US03954804A1
公开(公告)日:1976-05-04
A process for the production of high molecular weight unsaturated ketones by alkylation of low molecular weight .alpha.,.beta.-unsaturated ketones with an allyl alcohol at elevated temperature in the presence of an acid catalyst. The products are intermediates for the production of various natural substances and perfumes such as the damascenones, damascones or natural dyes such as zeaxanthin, rhodoxanthin or xanthophyll.
The present invention provides a pharmaceutical composition that has excellent safety and targets a different step in the virus propagation cycle than conventional pharmaceutical compositions, applicable as an antiviral agent. A pharmaceutical composition containing an epigallocatechin gallate derivative represented by the following chemical formula (1), an isomer thereof, or a salt thereof is prepared. This can be used as a membrane fusion inhibitor that inhibits viral membrane fusion. In the following formula, R
1
to R
6
are each a hydrogen atom, halogen, sodium, potassium, or a straight-chain or branched, saturated or unsaturated acyl group and may be identical to or different from one another. The acyl group may be substituted further with one or more substituents. At least one of R
1
to R
6
is the acyl group. R
7
to R
16
are each a hydrogen atom, halogen, sodium, or potassium and may be identical to or different from one another.