A palladium-catalyzed reductive carbonylation enables a facile and practical synthesis of aromatic aldehydes from aryl iodides and HCOOH. HCOOH serves not only as convenient and environmental-friendly C1 source but also as the reviving agent in the reductive elimination process of a Pd-catalyst.
G. Sun, X. Lv, M. Lei, L. Hu, Org. Lett., 2017, 19, 4235-4238.
An efficient catalytic Staudinger reduction at room temperature provides structurally diverse amines from azides in excellent yields in the presence of catalytic amounts of triphenylphosphine and diphenyldisiloxane as terminal reducing agent. The reaction exhibits high chemoselectivity and tolerates nitriles, alkenes, alkynes, esters, and ketones.
D. C. Lenstra, J. J. Wolf, J. Mecinović, J. Org. Chem., 2019, 84, 6536-6545.
A new, mild protocol for deoxygenation of various phosphine oxides with retention of configuration is described. Mechanistic studies regarding the oxygen transfer between the starting phosphine oxide and triphenylphosphine are also presented.
H.-C. Wu, J.-Q. Yu, J. B. Spencer, Org. Lett., 2004, 6, 4675-4678.
A reduction of sulfonyl chlorides in the presence of triphenylphosphine in toluene enables an efficient and convenient method for the synthesis of arylthiols.
E. V. Bellale, M. K. Chaudhari, K. G. Akamanchi, Synthesis, 2009, 3211-3213.
In a mild reduction of sulfoxides, sulfides are obtained in excellent yields when aliphatic and aromatic sulfoxides were treated with SOCl2 as a catalyst and Ph3P in THF at room temperature.
Y. Jang, K. T. Kim, H. B. Jeon, J. Org. Chem., 2013, 78, 6328-6331.
A CuI-catalyzed coupling reaction of aryl iodides and sulfur powder takes place in the presence of K2CO3 at 90°C in DMF as solvent. The coupling mixture is directly treated with NaBH4 or triphenylphosphine to afford aryl thiols in good to excellent yields. A wide range of substituted aryl thiols that bear methoxy, hydroxyl, carboxylate, amido, keto, bromo, and fluoro groups can be synthesized.
Y. Jiang, Y. Qin, S. Xie, X. Zhang, J. Dong, D. Ma, Org. Lett., 2009, 11, 5250-5253.
In the presence of Ph3P and a catalytic amount of Fe(TCP)Cl, ketenes react with EDA to give allenes in high yields under neutral conditions. By employing a chiral phosphine, allenes could be synthesized with high enantioselectivity in good yields.
C.-Y. Li, X.-B. Wang, X.-L. Sun, Y. Tang, J.-C. Zheng, Z.-H. Xu, Y.-G. Zhou, L.-X. Dai, J. Am. Chem. Soc., 2007, 129, 1494-1495.
Various carboxylic acids were converted into acyl azides in excellent yields in the presence of trichloroacetonitrile, triphenylphosphine and sodium azide at room temperature. The reaction allows the preparation of dipeptides without deprotection or rearrangement during the reaction.
J.-G. Kim, D. O. Jang, Synlett, 2008, 2072-2074.
Treatment of alcohols with a mixture of triphenylphosphine, carbon tetrachloride, oxime, and DBU in the presence of catalytic amounts of tetrabutylammonium iodide in refluxing acetonitrile regioselectively furnishes the corresponding O-alkyl ethers in good yields.
M. N. S. Rad, A. A. Khalafi-Nezhad, F. Karimitabar, S. Behrouz, Synthesis, 2010, 1724-1730.
Alkyl nitrites were prepared in good to excellent yields by treatment of alcohols and thiols with triphenylphosphine/2,3-dichloro-5,6-dicyanobenzoquinone/Bu4NNO2 in acetonitrile. This method allows a selective conversion of primary alcohols in the presence of secondary and tertiary alcohols and thiols.
B. Akhlaghinia, A. R. Pourali, Synthesis, 2004, 1747-1749.
A Ph3P/I--promoted dihalogenation of epoxides provides 1,2-dihalides in the presence of XCH2CH2X (X = Cl or Br) as the solvent and halogen source. All reagents are widely available and easy to handle. The protocol offers mild conditions and operational simplicity.
J. Long, J. Chen, R. Li, Z. Liu, X. Xiao, J.-H. Ling, X. Zheng, J.-C. Xiao, Synlett, 2019, 30, 181-184.
A reaction sequence involving a Wittig reaction, a Staudinger reaction, an aza-Wittig reaction, a 6π-3-azatriene electrocyclization, and a 1,3-H shift enables a quick one-pot synthesis of polysubstituted pyridines in very good yields from aldehydes, phosphorus ylides, and propargyl azide.
H. Wei, Y. Li, K. Xiao, B. Cheng, H. Wang, L. Hu, H. Zhai, Org. Lett., 2015, 17, 5974-5977.
A reductive cyclization of o-nitrobenzylidene amines under microwave conditions in the presence of MoO2Cl2(dmf)2 as catalyst and Ph3P as reducing agent delivers 2-aryl-2H-indazoles in good yields.
A. H. Moustafa, C. C. Malakar, N. Aljaar, E. Merisor, J. Conrad, U. Beifuss, Synlett, 2013, 24, 1573-1577.
A one-step reaction to assemble pyrroles from α,β-unsaturated imines and acid chlorides is mediated by triphenylphosphine, which eliminates phosphine oxide to allow cyclization. This reaction has been employed to access broad range of pyrroles via modulation of the two building blocks and applied as well to the synthesis of lukianol A.
Y. Lu, B. A. Arndtsen, Org. Lett., 2009, 11, 1369-1372.
A new and efficient three-component reaction between dialkyl acetylenedicarboxylates, aromatic amines, triphenylphosphine, and arylglyoxals afforded polysubstituted pyrrole derivatives in high yields. The reactions were performed in dichloromethane at room temperature and under neutral conditions.
M. Anary-Abbasinejad, K. Charkhati, H. Anaraki-Ardakani, Synlett, 2009, 1115-1117.
A reaction between dialkyl acetylenedicarboxylates and β-aminoketones promoted by triphenylphosphine allows an efficient one-pot synthesis of polysubstituted 2,5-dihydropyrrole derivatives. The prepared 2,5-dihydropyrroles can be easily oxidized to the corresponding pyrrole derivatives with chromium trioxide.
M. Anary-Abbasinejad, E. Poorhassan, A. Hassanabadi, Synlett, 2009, 1929-1932.
A novel, efficient, and general domino reaction of 2-acylaziridines with the Huisgen zwitterions furnishes 2-pyrazolines. A possible mechanism for the domino sequence is proposed.
S.-L. Cui, J. Wang, Y.-G. Wang, Org. Lett., 2008, 10, 13-16.
In one-pot Wittig olefination reactions of aldehydes, an excess of rasta resin-PPh3, a heterogeneous polystyrene-based phosphine, was used for the in situ generation of the phosphorane reactant and enabled the isolation of a high yield of very pure alkene product after only filtration and solvent removal. The excellent results obtained in this study are attributed to the flexible nature of the rasta resin structure.
P. S.-W. Leung, Y. Teng, P. H. Toy, Synlett, 2010, 1997-2001.
A polymer-bound, triphenylphosphine-supported reagent allows a one-pot, two-step synthesis of secondary amines from the corresponding azide and a reactive alkyl halide.
S. Ayesa, B. Samuelsson, B. Classon, Synlett, 2008, 89-93.
An efficient intermolecular amidation of quinoline N-oxides with sulfonamides in the presence of PhI(OAc)2 and PPh3 provides N-(quinolin-2-yl)sulfonamides in very good yields.
X. Yu, S. Yang, Y. Zhang, M. Guo, Y. Yamaoto, M. Bao, Org. Lett., 2017, 19, 6088-6091.