Enantioselective copper-catalyzed cyclization of γ-alkenylsulfonamides and a δ-alkenylsulfonamide in the presence of a range of vinyl arenes results in variously functionalized 2-substituted chiral nitrogen heterocycles via a formal alkene C-H functionalization process. Application of this reaction to the concise synthesis of a 5-HT(7) receptor antagonist is demonstrated.
Utilization of unsaturated esters as perfuming ingredients
申请人:——
公开号:US20030144173A1
公开(公告)日:2003-07-31
A compound of formula
1
wherein the symbol R′ represents a linear or branched, unsaturated or saturated hydrocarbon group having from 1 to 5 carbon atoms; R
1
, R
2
, R
3
, R
4
and R
5
represent, independently of each other, a hydrogen atom, a methyl, an ethyl or a methoxy group; R
6
and R
7
represent, independently of each other, a hydrogen atom, a methyl, ethyl, n-propyl or iso-propyl group; and wherein R
5
and R
6
, when taken together with the carbon atoms to which they are bound, may form a six-membered ring, is useful as perfuming ingredient for the preparation of perfuming compositions and perfumed products, to which it imparts odor notes of the floral and indol type without coloring problems in the final product.
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。
Mg-promoted carbon-acylation of aromatic aldehydes and ketones
Reductive cross-coupling of aromatic aldehydes and ketones with aliphatic acid chlorides promoted by Mg turnings in DMF Lit room temperature brought about efficient C-acylation to afford the corresponding alpha-acyloxy-alpha-aryl ketones in good yields. Treatment of alpha-methoxy or alpha-acetoxyacetophenones under similar conditions gave the corresponding alpha-acyloxystyrenes exclusively. The reaction may be initiated by electron transfer from Mg to the carbonyl groups of the substrates. (C) 2002 Elsevier Science Ltd. All rights reserved.
Acylation of β-oxoalkyltetracarbonylferrate(o). A novel route to enol ester