We have developed a concise diastereoselective total synthesis of (±)-parvistemonine A. By using a Mukaiyama–Michael addition, an aza-Wittig reaction, a Paal–Knorr pyrrole synthesis, an acid-mediated annulation, and a Mitsunobu reaction as key steps, we achieved a total synthesis in which the longest linear sequence was ten steps and the overall yield was 19.6%. Additionally, the relative stereochemistry
我们开发了一种简洁的 (±)-parvistemonine A 的非对映选择性全合成。 通过使用 Mukaiyama-Michael 加成、aza-Wittig 反应、Paal-Knorr 吡咯合成、酸介导的环化和 Mitsunobu 反应作为关键步骤,我们实现了最长的线性序列为十步的全合成,总产率为19.6%。此外,首次通过 X 射线晶体学分析证实了 parvistemonine A 的相对立体化学。
A New and Convenient Method of Synthesis of γ-Ketoaldehydes
作者:O. G. Kulinkovich、I. G. Tischenko、V. L. Sorokin
DOI:10.1055/s-1985-31427
日期:——
A new synthesis of 4-oxoalkanals starting from acid chlorides and allyl chloride proceeding via alkyl 2,3-dichloropropyl ketones, alkyl 3-chloropropenyl ketones, alkyl 3-chloro-2-methoxypropyl ketones, and 1-alkanoyl-2-methoxycyclopropanes is described.
An efficient synthesis of 2-substituted cyclopentenones is reported. Key reactions are the cylopropanation of 2,2-dimethyl-3(2H)-furanone and subsequent conversion to the title compounds by oxidative fragmentation.
Treatment of tribromofluoromethane with diethylzinc in DMF at -60 °C generated a zinc carbenoid reagent, which reacted with aldehydes RCHO chemoselectively to give RCH(OH)CFBr2 in moderate-to-good yields.
在 -60 °C 下,在 DMF 中用二乙基锌处理三溴氟甲烷生成类锌试剂,该试剂与醛 RCHO 化学选择性地反应,以中等至良好的收率得到 RCH(OH)CFBr2。
[EN] SKIN RENEWING AND HEALING MIXTURE OF PEPTIDE COMPONENTS AND ITS USE<br/>[FR] MÉLANGE DE CONSTITUANTS PEPTIDIQUES POUR LE RENOUVELLEMENT ET LA CICATRISATION DE LA PEAU ET SON UTILISATION
申请人:GLOBETECH INNOVATION S R O
公开号:WO2020152568A1
公开(公告)日:2020-07-30
A skin renewing and healing mixture of peptide components significantly accelerates the healing of wounds. It can be used in particular for the treatment of chronic, flamed and complicated wounds, but also common injuries, post-operative wounds or burns. In healthy patients, the mixture reduces the time required for healing up to one third; in the case of difficult-to-heal wounds, the skin renewing and healing mixture of peptide components reduces the time required for healing up to 7 times. With chronic wounds, in particular decubitus and venous ulcers, the skin renewing and healing mixture of peptide components ensures the improvement of wound healing or even the complete healing of the wound as a result of the effect of the combination of the peptide components. Preferably, the skin renewing and healing mixture of peptide components is applied to wounds in a sterile protein and saccharide gel matrix preventing infection development thus allowing more efficacious wound healing. The skin renewing and healing mixture of peptide components can be applied in aesthetic medicine and cosmetics.