Synthetic studies on polymaxenolides: model studies for constructing dihydropyran portion and synthesis of lower portion
摘要:
With a goal of the total synthesis of polymaxenolide, the first hybrid marine natural product, the model studies for constructing the dihydropyran portion based on the originally proposed biosynthesis (C-C bond formation followed by dehydrative cyclization) and the synthesis of the lower portion (the C1-C3, C7-C17 portion) based on an iodide-induced Morita-Baylis-Hillman type reaction (a three-component assembly) followed by Suzuki-Miyaura cross-coupling are described. (C) 2014 Elsevier Ltd. All rights reserved.
Ruthenium-Porphyrin-Catalyzed Diastereoselective Intramolecular Alkyl Carbene Insertion into CH Bonds of Alkyl Diazomethanes Generated In Situ from<i>N</i>-Tosylhydrazones
作者:Annapureddy Rajasekar Reddy、Cong-Ying Zhou、Zhen Guo、Jinhu Wei、Chi-Ming Che
DOI:10.1002/anie.201408102
日期:2014.12.15
slow addition with a syringe pump. From a synthetic point of view, the CH insertion of N‐tosylhydrazones can be viewed as reductivecoupling between a CO bond and a CH bond to form a new CC bond, since N‐tosylhydrazones can be readily prepared from carbonylcompounds. This reaction was successfully applied in a concise synthesis of (±)‐pseudoheliotridane.
Trimethysilyl triflate in organic synthesis11Part 11 of this series. Part 10: S. Murata and R. Noyori, Tetrahedron Letters 2107 (1981).
作者:R. Noyori、S. Murata、M. Suzuki
DOI:10.1016/s0040-4020(01)93263-6
日期:——
Trimethylsilyl triflate is a powerful silylating agent for organic compounds and acts as a catalyst which accelerates a variety of nucleophilic reactions in aprotic media. The reactions proceed via one-center, electrophilic coordination of the silyl group to hetero functional groups and exhibit unique selectivities.
Trimethylsilyl trifltate catalyzed aldol-type reaction of enol silyl ethers and acetals or related compounds
作者:Shizuaki Murata、Masaaki Suzuki、Ryoji Noyori
DOI:10.1016/s0040-4020(01)86671-0
日期:1988.1
condensation of enol trimethylsllyl ethers with acetals, orthoformate, or 2-acetoxytetrahydrofuran or -pyrans to give the corresponding β-alkoxy carbonylcompounds. Reaction of enolsilylethers and carboxonium triflate ion-pair intermediates occurs via acyclic transition states and exhibits moderate to high erythro selectivity independent of the geometry (E/Z) of the enolsilylethers.
Condensation of enol silyl ethers and dialkoxymethanes catalyzed by trimethylsilyl trifluoromethanesulfonate. Regiospecific synthesis of α-alkoxymethyl ketones
作者:S. Murata、M. Suzuki、R. Noyori
DOI:10.1016/0040-4039(80)80118-3
日期:——
A facile, regiospecific entry to α-alkoxymethyl ketones is described.
描述了α-烷氧基甲基酮的容易的,区域特异性的进入。
Microbiological transformations. Part 51: The first example of a dynamic kinetic resolution process applied to a microbiological Baeyer–Villiger oxidation
The dynamic resolution of racemic 2-benzyloxymethylcyclopentanone 1 upon microbiologically mediated Baeyer–Villiger oxidation allowed the corresponding (R)-lactone 2 to be prepared in 85% yield and 96% ee.