Copper-Mediated Deoxygenative Trifluoromethylation of Benzylic Xanthates: Generation of a CCF<sub>3</sub>Bond from an O-Based Electrophile
作者:Lingui Zhu、Shasha Liu、Justin T. Douglas、Ryan A. Altman
DOI:10.1002/chem.201302328
日期:2013.9.16
are capable of converting O‐based electrophiles into trifluoromethanes. The copper‐mediated trifluoromethylation of benzylicxanthates using Umemoto’s reagent as the source of CF3 to form CCF3 bonds is described. The method is compatible with an array of benzylicxanthates bearing useful functional groups. A preliminary mechanistic investigation suggests that the CCF3 bond forms by reaction of the
Base-Induced Cyclization of Active Methylene Isocyanides with Xanthate Esters: An Efficient Method for the Synthesis of 5-Alkoxy-4-(tosyl/ethoxycarbonyl)-1,3-thiazoles
Sodium hydride-induced cyclization of 1-[(isocyanomethyl)sulfonyl]-4-methylbenzene or ethyl isocyanoacetate with various xanthate esters gave 5-alkoxy-4-tosylthiazoles or ethyl 5-alkoxythiazol-4-ylcarboxylates, respectively, in good to excellent yields. The xanthate ester S-methyl O-phenyl dithiocarbonate gave 5-(methylsulfanyl)-4-tosyl-1,3-thiazole when treated with 1-[(isocyanomethyl)sulfonyl]-4-methylbenzene
The reaction of arylmethyl isocyanides and arylmethylamines with xanthate esters: a facile and unexpected synthesis of carbamothioates
作者:Narasimhamurthy Rajeev、Toreshettahally R Swaroop、Ahmad I Alrawashdeh、Shofiur Rahman、Abdullah Alodhayb、Seegehalli M Anil、Kuppalli R Kiran、Chandra、Paris E Georghiou、Kanchugarakoppal S Rangappa、Maralinganadoddi P Sadashiva
DOI:10.3762/bjoc.16.18
日期:——
formation of carbamothioates by a sodium hydride-mediated reaction of arylmethyl isocyanides with xanthateesters in DMF is reported. The products thus obtained were compared with the carbamothioates obtained by the sodium hydride-mediated condensation of the corresponding benzylamines and xanthateesters in DMF. To account for these unexpected reactions, a mechanism is proposed in which the key steps are
The electrochemical fluorination of organosulfur compounds in triethylamine/hydrofluoric acid (Et3N-5 HF) with polystyrene-supported iodobenzene (PSIB) and tetraethylammonium chloride (Et4NCl) was performed successfully in an undivided cell under constant current conditions to afford the corresponding fluorinated compounds in moderate to good yields. Recycle use of the PSIB could be achieved due to
The reagent consisting of 70% HFâpy (py = pyridine) and a
halonium oxidant converts RâOCS
2
Me into either
RâOCF
3
(R = primary) or RâF (R = secondary,
tertiary or benzylic) whereas the 50% HFâpy system converts
RâOCS
2
Me (R = secondary) into
RâOCF
3
.