A method of preparing an acid additional salt of delta-aminolevulinic acid
申请人:Japan Tobacco Inc.
公开号:EP0483714A1
公开(公告)日:1992-05-06
An acid addition salt of δ-aminolevulinic acid is prepared in such a way that tetrahydrofurfurylamine (VI) is reacted with phthalic anhydride under an anhydrous condition to introduce a phthal group which protects amino group of tetrahydrofurfurylamine to give N-tetrahydrofurfuryl phthalimide (III), carbon atoms of the first- and fourth-positions of thus obtained N-tetrahydrofurfurylphthalimide (III) are oxidized at 80°C using sodium periodate as a oxidizing agent and ruthenium chloride hydrate as a catalyst to yield 5-phthalimidolevulinic acid (II), then the protecting group of 5-phthalimidolevulinic acid (II) is deprotected using an acid to prepare an acid additional salt of δ-aminolevulinic acid. The acid additional salt of δ-aminolevulinic acid is readily converted by neutralization by an alkali to δ-aminolevulinic acid, which is very useful as a precursor of Vitamin B₁₂, heme and chlorophyll.
γ-Methyl-substituted-γ-butyrolactones: solid-phase synthesis employing a cyclisation–cleavage strategy
作者:Nicolas Gouault、Jean-François Cupif、Armelle Sauleau、Michèle David
DOI:10.1016/s0040-4039(00)00921-7
日期:2000.9
The solid-phase synthesis of several gamma-methyl-substituted-gamma-butyrolactones using a cyclisation-cleavage reaction is reported. Chemical modifications of polymer-bound azido (2a) and iodo alcohols (2b) were realised in order to introduce additional diversity onto the lactone structure. (C) 2000 Elsevier Science Ltd. All rights reserved.
US5284973A
申请人:——
公开号:US5284973A
公开(公告)日:1994-02-08
Photochemical Synthesis of Lactones, Cyclopropanes and ATRA Products: Revealing the Role of Sodium Ascorbate**
作者:Marie Rrapi、Charikleia S. Batsika、Nikolaos F. Nikitas、Nicholas D. C. Tappin、Ierasia Triandafillidi、Philippe Renaud、Christoforos G. Kokotos
DOI:10.1002/chem.202400253
日期:——
Photochemistry: A direct and mild photochemical synthesis of lactones, cyclopropanes and ATRA products, utilizing sodium ascorbate or ascorbic acid as the halogen/hydrogen bonding mediator and irradiation at 370 nm, 390 nm or 427 nm LED as the irradiation source. A variety of iodo-reagents were activated via halogen or hydrogen bonding and reacted successfully with a number of alkenes without the use