合成了一系列甲基取代的环庚-2-烯基三甲基锡和三甲基硅烷,并通过1 H,13 C和119 Sn(或29 Si)nmr光谱表征。讨论了其中一些化合物的关键构象特征。这些锡烷和硅烷的酸解反应(使用CF 3 COOD)可以干净地进行,以提供2 H取代的甲基环庚烯,这是由于亲电子的烯丙基重排(即区域特异性γ攻击)引起的(S E ')。对甲基环庚烯的2 H nmr光谱进行详细检查,建立了高度优选的γ-抗(如果不是特异性的话)亲电传递模式。因此,该γ-抗-S E '方法可以形成有时在用于功能化的笨拙的环系统中的合成有用的应用的基础。
Acetylenes as potential antarafacial components in concerted reactions. Formation of pyrroles from thermolyses of propargyl amines, of a dihydrofuran from a propargylic ether, and of an ethylidenepyrrolidine from a .beta.-amino acetylene
摘要:
A thermal cyclization of acetylenic compounds provides evidence for the ability of acetylenic links to act as antarafacial components in [2 + 2] processes. The cyclization competes with the normally favored acetylenic retro-ene reaction. Propargylic amines, without substituents whose presence would hinder a tight cyclic transition state, yield intermediate pyrrolines whose subsequent hydrogen elimination affords pyrroles in small amounts. The same process in 2-ethynyltetrahydropyran affords 8-oxabicyclo[3.2.1]octane in 35% yield. A related thermal reaction of N-methyl-3-hexyn-1-amine provides a quantitative transformation to N-methyl-2-ethylidenepyrrolidine in a nominal [2s + 2a + 2s + 2s] Mobius process, wherein the acetylenic unit is the antarafacial component. Evidence for concertedness in these reactions is discussed.
[EN] AMINOMETHYL-AZACYCLE DERIVATIVES AS INHIBITORS OF MONOAMINE UPTAKE<br/>[FR] DERIVES D'AMINOMETHYL-AZACYCLE INHIBITEURS D'ABSORPTION DE FIXATION DE MONOAMINE
申请人:LILLY CO ELI
公开号:WO2005118531A1
公开(公告)日:2005-12-15
The present invention provides compounds of formula (I) wherein A is (1), (2), (3), (4), (5), (6) or (7) and wherein R1, R7, y and Ar 1 are defined herein. The compounds are inhibitors of the uptake of one or more monoamines selected from serotonin, norepinephrine and dopamine and, as such, may be useful in the treatment of disorders of the central and/or peripheral nervous system.
Stereochemical requirements of acetylenic retro-ene transition states
作者:Alfred Viola、John J. Collins
DOI:10.1039/c39800001247
日期:——
Retro-ene reactions of acetylenic and olefinic substrates differ in the stereochemicalrequirements of their respective transitionstates; reactions of olefins proceed via a chair-like (or boat-like) configuration while those of acetylenes require planarity.
Efficient Enantioselective Synthesis of Functionalized Tetrahydropyrans by Ru-Catalyzed Asymmetric Ring-Opening Metathesis/Cross-Metathesis (AROM/CM)
作者:Dennis G. Gillingham、Osamu Kataoka、Steven B. Garber、Amir H. Hoveyda
DOI:10.1021/ja0458672
日期:2004.10.1
efficient method for enantioselectivesynthesis of highly functionalized pyrans (up to 98% ee) through Ru-catalyzed asymmetricring-opening metathesis/cross-metathesis is described. Reactions are promoted by a recyclable chiral Ru-chloride or a new chiral Ru-iodide complex; the latter catalyst is less efficient but gives rise to significantly higher levels of enantioselectivity. Catalytic reactions can be
Production of 2,5-Dihydrofurans and Analogous Compounds
申请人:Njardarson Jon
公开号:US20090131691A1
公开(公告)日:2009-05-21
Vinyl oxiranes are rearranged to 2,5-dihydrofuran using catalyst (III) or (IV). The 2,5-dihydrofuran can be reduced to tetrahydrofuran. 3,4-Epoxy-1-butene substrate is converted to 2,5-dihydrofuran which in turn is converted to tetrahydrofuran. Substrate for making 3-methyltetrahydrofuran is prepared from isoprene. Substrate for making 2-methyltetrahydrofuran is prepared from piperylene. Reactions analogous to that with vinyl oxiranes are carried out with vinyl thiiranes and vinyl aziridines.
A therapeutic/preventive agent for cognitive dysfunctions, which comprises as an active ingredient an imide derivative of the following formula [1]:
wherein Z is a group of the formula [2]:
D is a group of —(CH
2
)
p
—A—(CH
2
)
q
—; G is =N—, —CH—, etc.; and Ar is an aromatic heterocyclic group, etc.
一种认知功能障碍的治疗/预防剂,其活性成分包括下式[1]的亚胺衍生物:
其中 Z 是式 [2] 的基团:
D 是-(CH
2
)
p
-A-(CH
2
)
q
-;G 为 =N-、-CH- 等;Ar 为芳香杂环基团等。