Bi(III) halides as efficient catalysts for the O-acylative cleavage of tetrahydrofurans: an expeditious entry to tetralins
作者:Simon J. Coles、James F. Costello、William N. Draffin、Michael B. Hursthouse、Simon P. Paver
DOI:10.1016/j.tet.2005.02.080
日期:2005.5
O-acylative cleavage of tetrahydrofurans using organic acid halides with catalytic Bi(III) halides is reported. X-ray crystallography is used to rationalise the failure of the reaction in the case of certain crowded acid chlorides, and a useful aspect of chemoselectivity is revealed. The synthetic potential of this reaction is illustrated with a highly efficient O-acylative cleavage/intramolecular
BITTER TASTE MODIFIERS INCLUDING SUBSTITUTED 1-BENZYL-3-(1-(ISOXAZOL-4-YLMETHYL)-1H-PYRAZOL-4-YL)IMIDAZOLIDINE-2,4-DIONES AND COMPOSITIONS THEREOF
申请人:SENOMYX, INC.
公开号:US20160376263A1
公开(公告)日:2016-12-29
The present invention includes compounds and compositions known to modify the perception of bitter taste, and combinations of said compositions and compounds with additional compositions, compounds, and products. Exemplary compositions comprise one or more of the following: cooling agents; inactive drug ingredients; active pharmaceutical ingredients; food additives or foodstuffs; flavorants, or flavor enhancers; food or beverage products; bitter compounds; sweeteners; bitterants; sour flavorants; salty flavorants; umami flavorants; plant or animal products; compounds known to be used in pet care products; compounds known to be used in personal care products; compounds known to be used in home products; pharmaceutical preparations; topical preparations; cannabis-derived or cannabis-related products; compounds known to be used in oral care products; beverages; scents, perfumes, or odorants; compounds known to be used in consumer products; silicone compounds; abrasives; surfactants; warming agents; smoking articles; fats, oils, or emulsions; and/or probiotic bacteria or supplements.
Metallaphotoredox-catalysed sp3–sp3 cross-coupling of carboxylic acids with alkyl halides
作者:Craig P. Johnston、Russell T. Smith、Simon Allmendinger、David W. C. MacMillan
DOI:10.1038/nature19056
日期:2016.8
remains an important yet elusive objective for engineering cross-coupling reactions. In comparison to related procedures with sp2-hybridized species, the development of methods for sp3–sp3 bondformation via transition metal catalysis has been hampered historically by deleterious side-reactions, such as β-hydride elimination with palladium catalysis or the reluctance of alkyl halides to undergo oxidative
Alkylation of acetals using manganate–BF3·OEt2 mixed reagent
作者:Makoto Hojo、Nobuo Ushioda、Akira Hosomi
DOI:10.1016/j.tetlet.2004.04.050
日期:2004.5
ether converted acetals to alkylation products, where an alkoxy group of acetals was substituted by the alkyl group of manganese reagent used. Ketals also reacted with the `mixed reagent' to afford the corresponding alkylation products in high yield. α-Alkoxy-substituted cyclic ethers and acetoxy-substituted cyclic ethers were selectively converted to ring-opening alkylation products and α-alkyl-substituted
仅通过将两种试剂在醚转化的缩醛中搅拌而预先制备的“ R 3 MnMgBr”和BF 3 ·OEt 2的混合物,其中缩醛的烷氧基被所用的锰试剂的烷基取代。缩酮还与“混合试剂”反应,以高收率提供相应的烷基化产物。将α-烷氧基取代的环状醚和乙酰氧基取代的环状醚分别选择性地转化为开环烷基化产物和α-烷基取代的环状醚。
The Combination of Benzaldehyde and Nickel‐Catalyzed Photoredox C(sp
<sup>3</sup>
)−H Alkylation/Arylation
作者:Lumin Zhang、Xiaojia Si、Yangyang Yang、Marc Zimmer、Sina Witzel、Kohei Sekine、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201810526
日期:2019.2.4
Herein we report a highly selective photoredoxC(sp3)−H alkylation/arylation of ethers through the combination of a photo‐organocatalyst (benzaldehyde) and a transition‐metal catalyst (nickel). This method provides a simple and general strategy for the C(sp3)−H alkylation/arylation of ethers. A selective late‐stage modification of (−)‐ambroxide has also been conducted to demonstrate the applicability