1. Synthesis of the common C.1–C.13 hydrophobic domain of the B-type amphidinolides
摘要:
In this letter, the first of two in this issue, we describe the synthesis of the C.1-C.13 hydrophobic domain common to the B-type amphidinolides. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
1. Synthesis of the common C.1–C.13 hydrophobic domain of the B-type amphidinolides
摘要:
In this letter, the first of two in this issue, we describe the synthesis of the C.1-C.13 hydrophobic domain common to the B-type amphidinolides. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
[EN] MACROCYCLIC PICOLINAMIDES AS FUNGICIDES<br/>[FR] PICOLINAMIDES MACROCYCLIQUES À UTILISER EN TANT QUE FONGICIDES
申请人:DOW AGROSCIENCES LLC
公开号:WO2017116954A1
公开(公告)日:2017-07-06
The invention relates to macrocyclic picolinamides of Formula (I) and their use as fungicides.
本发明涉及式(I)所示的大环吡啶酰胺及其作为杀菌剂的应用。
An asymmetric pericyclic cascade approach to 3-alkyl-3-aryloxindoles: generality, applications and mechanistic investigations
作者:Edward Richmond、Kenneth B. Ling、Nicolas Duguet、Lois B. Manton、Nihan Çelebi-Ölçüm、Yu-Hong Lam、Sezen Alsancak、Alexandra M. Z. Slawin、K. N. Houk、Andrew D. Smith
DOI:10.1039/c4ob02526a
日期:——
The reaction of l-serine derived N-arylnitrones with alkylarylketenes generates 3-alkyl-3-aryloxindoles in good yields and excellent enantioselectivities.
intermediate for rings B and C, but was faced with final protecting group problems. The second, and successful approach, involved a 1,2-phenylsulfeno migration and a sulfur directed glycosidation procedure to link rings B and C, as well as an acyl fluoride intermediate to install the sterically hindered aryl ester moiety (ring A1). The final stages of the synthesis of the required 2-phenylseleno glycosyl fluoride
Diastereoselective silylene transfer reactions to chiral enantiopure alkenes: effects of ligand size and substrate bias
作者:Christina Z. Rotsides、K. A. Woerpel
DOI:10.1039/c6dt04612f
日期:——
the stereoselective construction of compounds containing carbon–silicon bonds. Despite their synthetic utility, the development of either an enantioselective or diastereoselective metal-catalyzed silylene transfer reaction, in which ligands on the metal catalyst control stereoselectivity, has not been achieved. In this article, we report that the structure of the alkene is the most important for controlling
Diastereofacial selectivity in the reaction of chiral N-trimethylsilyl imines with ester enolates: Preparation of trans-azetidin-2-ones in high stereocontrolled fashion.
Highly efficient chiral ester enolate-imine condensation, giving 3,4-disubstituted β-lactams with excellent trans-syn or trans-anti diastereoselectivity, is reported. The chiral information is included in the electrophilic partner of the condensation, nominally chiral α-, β-silyloxy- or alkoxy-N-trimethylsilyl-imines. The highdiastereofacialselectivity is determined by the correct choice of the metal
据报道,高效手性酯烯酸酯-亚胺缩合可产生具有出色的反式-顺式或反式-非对映体选择性的3,4-二取代的β-内酰胺。手性信息包括在缩合的亲电子伙伴中,名义上为手性α-,β-甲硅烷氧基-或烷氧基-N-三甲基甲硅烷基亚胺。高非对映选择性是由反应介质中存在的金属阳离子的正确选择和羟基保护基团的性质决定的。通过这种方法,已经获得了许多氮杂环丁酮类化合物,它们是合成商业上感兴趣的β-内酰胺类抗生素的中间体。报道了如此获得的氮杂环丁酮的完全归属的1 H和13 C NMR谱。