[EN] PROCESS FOR PRODUCING PYRIPYROPENE DERIVATIVES<br/>[FR] PROCÉDÉ DE PRODUCTION DE DÉRIVÉS DE PYRIPYROPÈNE
申请人:MEIJI SEIKA KAISHA
公开号:WO2011108155A1
公开(公告)日:2011-09-09
Disclosed is a process for efficiently producing pyripyropene derivatives having acyloxy at the 1-position and 11-position and hydroxyl at the 7-position. The process comprises selectively acylating hydroxyl at the 1-position and 11-position of a compound represented by formula Bl through one to three steps with an acylating agent in the presence or absence of a base.
Ruthenium-Catalyzed Transformations of Cyclopropylethynes
作者:Pierre Dixneuf、Armin de Meijere、Ingo Emme、Christian Bruneau、Hans-Christian Militzer
DOI:10.1055/s-2007-990874
日期:2007.11
CMeCH 2 ) 2 (dppb)] catalysis to give 2-(trans-2-ethoxycyclopropyl)ethenyl esters 13 (69-92%, 3 examples). (1-Hydroxycyclopropyl)ethyne (14), under catalysis by [Ru(O 2 CH)(CO)2(PPh 3 )] 2 , reacts with carboxylic acids to yield 1-acetylcyclopropyl esters 15 (49-74%, 4 examples) by Markovnikov-sense addition and intramolecular transesterification. Anti-Markovnikov- and Markovnikov-sense addition of carboxylic
A Metallacycle Fragmentation Strategy for Vinyl Transfer from Enol Carboxylates to Secondary Alcohol C–H Bonds via Osmium- or Ruthenium-Catalyzed Transfer Hydrogenation
作者:Boyoung Y. Park、Tom Luong、Hiroki Sato、Michael J. Krische
DOI:10.1021/jacs.5b04688
日期:2015.6.24
A strategy for catalytic vinyl transfer from enol carboxylates to activated secondaryalcohol C-H bonds is described. Using XPhos-modified ruthenium(0) or osmium(0) complexes, enol carboxylate-carbonyl oxidative coupling forms transient β-acyloxy-oxametallacycles, which eliminate carboxylate to deliver allylic ruthenium(II) or osmium(II) alkoxides. Reduction of the metal(II) salt via hydrogen transfer
描述了从烯醇羧酸盐催化乙烯基转移到活化的仲醇 CH 键的策略。使用 XPhos 修饰的钌 (0) 或锇 (0) 配合物,烯醇羧酸盐 - 羰基氧化偶联形成瞬态 β-酰氧基 - 氧杂金属环,消除羧酸盐以提供烯丙基钌 (II) 或锇 (II) 醇盐。通过来自仲醇反应物的氢转移还原金属 (II) 盐,释放出甲醇 CH 乙烯基化的产物,并再生酮和零价催化剂。