33234-57-0Relevant articles and documents
Metal-Free Directed C?H Borylation of Pyrroles
Wang, Zheng-Jun,Chen, Xiangyang,Wu, Lei,Wong, Jonathan J.,Liang, Yong,Zhao, Yue,Houk, Kendall N.,Shi, Zhuangzhi
supporting information, p. 8500 - 8504 (2021/03/16)
Robust strategies to enable the rapid construction of complex organoboronates in selective, practical, low-cost, and environmentally friendly modes remain conspicuously underdeveloped. Here, we develop a general strategy for the site-selective C?H borylation of pyrroles by using only BBr3 directed by pivaloyl groups, avoiding the use of any metal. The site-selectivity is generally dominated by chelation and electronic effects, thus forming diverse C2-borylated pyrroles against the steric effect. The formed products can readily engage in downstream transformations, enabling a step-economic process to access drugs such as Lipitor. DFT calculations (wB97X-D) demonstrate the preferred positional selectivity of this reaction.
Antimalarial activity of natural and synthetic prodiginines
Papireddy, Kancharla,Smilkstein, Martin,Kelly, Jane Xu,Shweta,Salem, Shaimaa M.,Alhamadsheh, Mamoun,Haynes, Stuart W.,Challis, Gregory L.,Reynolds, Kevin A.
experimental part, p. 5296 - 5306 (2011/10/02)
Prodiginines are a family of linear and cyclic oligopyrrole red-pigmented compounds. Herein we describe the in vitro antimalarial activity of four natural (IC50 = 1.7-8.0 nM) and three sets of synthetic prodiginines against Plasmodium falciparum. Set 1 compounds replaced the terminal nonalkylated pyrrole ring of natural prodiginines and had diminished activity (IC 50 > 2920 nM). Set 2 and set 3 prodiginines were monosubstituted or disubstituted at either the 3 or 5 position of the right-hand terminal pyrrole, respectively. Potent in vitro activity (IC50 = 0.9-16.0 nM) was observed using alkyl or aryl substituents. Metacycloprodiginine and more potent synthetic analogues were evaluated in a P. yoelii murine patent infection using oral administration. Each analogue reduced parasitemia by more than 90% after 25 (mg/kg)/day dosing and in some cases provided a cure. The most favorable profile was 92% parasite reduction at 5 (mg/kg)/day, and 100% reduction at 25 (mg/kg)/day without any evident weight loses or clinical overt toxicity.
A NEW AND EFFECTIVE AMINOMETHYLATION BY THE USE OF N-(p-TOLUENESULFONYLMETHYL)-p-TOLUENESULFONAMIDE AS AN EQUIVALENT OF METHANIMINE. A CONVENIENT PREPARATION OF PYRROLE COMPOUNDS
Kinoshita, Hideki,Inomata, Katsuhiko,Hayashi, Masatoshi,Kondoh, Takeshi,Kotake, Hiroshi
, p. 1033 - 1036 (2007/10/02)
Readily available N-(p-toluenesulfonylmethyl)-p-toluenesulfonamide was treated with base to generate N-methylene-p-toluenesulfonamide which reacted with a variety of nucleophiles forming the corresponding N-tosyl-aminomethylated compounds in good yields.Furthermore, the N-tosyl-aminomethylated acetals thus obtained were converted into the corresponding N-tosylpyrroles with the aid of acid catalyst in excellent yields.