5336-17-4Relevant academic research and scientific papers
Synthesis and structure revision of dimeric tadalafil analogue adulterants in dietary supplements
Mandava, Suresh,Ganganna, Bogonda,Hwang, Jungjoong,Jang, Younchang,Hwang, Jiho,Samala, Mallesham,Kim, Ki-Bbeum,Park, Haeil,Lee, Ji Hyun,Baek, Sun Young,Lee, Jongkook
, p. 498 - 503 (2017)
A number of phosphodiesterase 5 (PDE5) inhibitors approved by authorities have been used successfully in the treatment of erectile dysfunction. These medicines must be prescribed carefully due to their adverse effects, but they and their analogues are being illegally added to dietary supplements. These illegal dietary supplements pose a significant risk to public health. Several dimeric tadalafil analogues have been synthesized for use as reference standards in the inspection of functional foods that are mainly advertised as sexual enhancement products. During the course of this synthesis, 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxid hexafluorophosphate (HATU) was proven to be the reagent of choice for amide coupling to produce these dimeric tadalafil analogues. Moreover, the trans-isomer structures tentatively assigned for the isolated dimeric tadalafil analogues (bisprehomotadalafil and bisprecyclopentyltadalafil) found in dietary supplements are now revised to cis-isomer structures.
Efficient and Scalable Synthesis of Glucokinase Activator with a Chiral Thiophenyl-Pyrrolidine Scaffold
Fujieda, Hiroki,Maeda, Koji,Kato, Noriyasu
, p. 69 - 77 (2019/01/24)
Herein we describe the practical synthesis of a potent glucokinase activator (1) that has a chiral thiophenyl-pyrrolidine scaffold. The key to the successful synthesis was the application of a telescoped chiral-pool synthesis from a commercially available l-proline methyl ester derivative to introduce the chirality of the thiophenyl-pyrrolidine moiety. This second-generation synthesis of 1 provided several advantages over the previous method including an operational simplicity and avoidance of purification by column chromatography. The industrial relevance of this synthetic method in large-scale preparation was demonstrated by the production of 54.6 kg of 1 with an excellent chemical and optical purity.
