- Visible-Light-Triggered Iodinations Facilitated by Weak Electrostatic Interaction of N-Heterocyclic Carbenes
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N-heterocyclic carbenes (NHCs) are well-known as ligands and organocatalysts, but there is no recognition for their catalytic role as a stabilizer through electrostatic interaction rather than electron donation. By utilizing the electrostatic interaction, we herein describe the success of a visible-light-triggered radical-radical cross-coupling of N-alkenoxypyridinium salts and NaI, giving a variety of α-iodo ketones. Computational studies characterize the stabilization role of NHCs.
- Chen, Xiang-Yu,Liu, Qiang,Lu, Yu,Sheng, He,Su, Xiao-Di,Wang, Zhi-Xiang
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supporting information
p. 7187 - 7192
(2020/10/02)
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- A new synthetic approach to prostaglandin analogues: Synthesis of bimatoprost via lipase enzymatic catalysis
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A simple, convenient and efficient synthetic approach for the synthesis of (15S) bimatoprost (4) via lipase enzyme mediated stereo selective reduction from chiral precursor Corey lactone diol as substrate was described. Swern oxidation, lipase enzymatic reduction and Wittig reaction conditions are used as key steps for the synthesis of bimatoprost. This method was found to be an efficient with considerable yield, cost effective and minimized the synthetic steps compared to reported procedures.
- Kamidi, Vijendhar,Kale, Pooja,Boodida, Sathyanarayana
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p. 2767 - 2770
(2017/11/10)
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- One-pot synthesis of α-iodoketones from alcohols using ammonium iodide and Oxone in water
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A novel protocol for the synthesis of α-iodoketones from alcohols has been developed. Using water as the reaction medium, ammonium iodide and Oxone was proven to be an efficient reagent system for this reaction and afforded the corresponding α-iodoketones in moderate to good yields. The generality of this reaction was demonstrated with various secondary alcohols such as benzylic alcohols and aliphatic alcohols (acyclic and cyclic).
- Reddy, Marri Mahender,Swamy, Peraka,Naresh, Mameda,Srujana, Kodumuri,Durgaiah, Chevella,Rao, Tumula Venkateshwar,Narender, Nama
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p. 12186 - 12190
(2015/02/19)
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- A Facile and Efficient Synthesis of (15R)-Latanoprost from Chiral Precursor Corey Lactone Diol
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An efficient asymmetric synthetic route for the synthesis of anti-glaucoma agent, (15R)-latanoprost using Corey lactone diol as chiral substrate under Swern oxidation, allylic reduction and Wittig reaction conditions has been developed. In this method, reduction of keto and alkene functional groups has been achieved in a single step using low cost catalyst NiCl2/NaBH4 in methanol. This new synthetic protocol is a good alternative for the synthesis of latanoprost with high stereo selectivity and improved yield. [Figure not available: see fulltext.]
- Vijendhar,Srinivas,Boodida, Sathyanarayana
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p. 2023 - 2028
(2015/12/30)
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- Synthesis of (±)-bimatoprost
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A general synthetic approach has been developed for the synthesis of a key intermediate (6) that can be elaborated into several ophthalmic prostaglandins and their derivatives. Using these strategy, we have obtained (±)-bimatoprost (1) and its analog, (±)-homobimatoprost (5). Copyright Taylor & Francis Group, LLC.
- Harikrishna,Mohan, H. Rama,Dubey,Shankar,Subbaraju, Gottumukkala V.
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p. 1288 - 1305
(2012/04/10)
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- Oxidative iodination of carbonyl compounds using ammonium iodide and oxone
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A simple, efficient, mild, and regioselective method for oxyiodination of carbonyl compounds has been reported by using NH4I as the source of iodine and Oxone as an oxidant. Various carbonyl compounds such as aralkyl ketones, aliphatic ketones (acyclic and cyclic), and β-keto esters proceeded to the respective α-monoiodinated products in moderate to excellent yields. Unsymmetrical aliphatic ketones reacted smoothly yielding a mixture of 1-iodo and 3-iodo ketones with the predominant formation of 1-iodoproduct.
- Marri, Mahender Reddy,MacHarla, Arun Kumar,Peraka, Swamy,Nama, Narender
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supporting information; experimental part
p. 6554 - 6559
(2012/01/02)
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- Metal catalyst-free direct α-iodination of ketones with molecular iodine
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Ketones are directly converted to the corresponding α-iodoketones in good yields with molecular iodine under metal catalyst-free conditions. A significant difference in the reactivities was observed for aliphatic and aromatic ketones; whereas aliphatic ke
- Rao, Maddali L.N.,Jadhav, Deepak N.
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p. 6883 - 6886
(2007/10/03)
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- Process for the preparation of latanoprost
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Disclosed is a novel process for the preparation of the anti-glaucoma drug Latanoprost, in good yield, in large amounts and with desired purity. Also disclosed are novel intermediates for the above process.
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- Preparation of 1-aminoalkylphosphonic acids and 2-aminoalkylphosphonic acids by reductive amination of oxoalkylphosphonates
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By reacting dialkyl 1-oxo- or 2-oxoalkylphosphonates with benzhydrylamine followed by reduction with triacetoxyborohydride and acid hydrolysis gave corresponding aminoalkylphosphonic acids with satisfactory yields. The use of benzylamine, α-methylbenzylamine and tritylamine was unsuccessful in the case of dialkyl 1-oxoalkylphosphonates whereas conversion of 2-oxoalkylphosphonates was also achieved although with lower yields.
- Ryglowski, Artur,Kafarski, Pawel
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p. 10685 - 10692
(2007/10/03)
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