alkylation of α-sulfinyl carbanions can take place under biphasic conditions. These new conditions provide a simple, mild and efficient route to allylated sulfoxides in good yields. The reaction tolerates a wide variety of EWG groups as additional carbanion stabilizing groups such as ester, acetyl, cyano, amide, sulfonyl and sulfinyl functions.
Stereocontrol by Quaternary Centres: A Stereoselective Synthesis of (−)-Luminacin D
作者:Nathan Bartlett、Leona Gross、Florent Péron、Daniel J. Asby、Matthew D. Selby、Ali Tavassoli、Bruno Linclau
DOI:10.1002/chem.201304776
日期:2014.3.17
can be achieved by 1,3‐chelation‐controlled allylation of aldehydes that possess a non‐chelating α‐ether substituent, even if the α‐position is a quaternarycentre and/or a spiro‐epoxide. This reaction was used as a key step in an enantioselective synthesis of the angiogenesis inhibitor luminacin D.
Simple treatment of aldehydes with the carbonylcompounds (1)[R2COCH2S(O)nAr; n= 0,1,2] and piperidine stereoselectively produces the condensation products (7), the stereochemistry of which is controlled by the steric requirements of two functional groups COR2 and S(O)nAr in a sulphur-stabilized carbanion intermediate.
Described herein are compounds, compositions and methods directed to the treatment of ophthalmic conditions characterized by oxidative stress or damage in a subject by reducing the reactive oxygen species in the subject. Also described herein are methods for reducing ophthalmic photooxidative damage in a subject.
A Sulfoxide Reagent for One‐Pot, Three‐Component Syntheses of Sulfoxides and Sulfinamides**
作者:Fumito Saito
DOI:10.1002/anie.202213872
日期:2022.12.23
Upon Grignard reactions, a simple sulfoxide reagent allows the formation of sulfenate anions that are subsequently transformed into sulfoxides and sulfinamides. This one-pot, three-component method does not require substrates with preinstalled sulfur functional groups.