Asymmetric hetero-Diels–Alder reactions of alkenyldihydrooxazoles. Synthesis of oxazolo[3,2-c]pyrimidines and related compounds
作者:Mark C. Elliott、Elbertus Kruiswijk
DOI:10.1039/a905700e
日期:——
Alkenyldihydrooxazoles undergo a highly diastereoselective formal aza-Diels–Alder reaction with aryl and arenesulfonyl isocyanates to give oxazolo[3,2-c]pyrimidines. Depending on the substitution pattern of the alkenyldihydrooxazole, these compounds may then undergo addition of a second equivalent of the isocyanate to give either tetrahydrooxazolo[3,2-c]pyrimidine-8-carboxamides or octahydroazeto[2
烯基二氢恶唑与芳基和芳烃磺酰基异氰酸酯进行高度非对映选择性的正式aza-Diels-Alder反应,生成oxazolo [3,2- c ]嘧啶。然后,根据烯基二氢恶唑的取代方式,可以将这些化合物加入第二当量的异氰酸酯,以得到四氢恶唑并[ 3,2 - c ]嘧啶-8-羧酰胺或八氢氮杂并[2,3- d ]恶唑[3]。 ,2- c ]嘧啶。第二种添加对空间和电子因素敏感,在某些情况下可以防止。
Synthesis and in vitro antimycobacterial activity of compounds derived from (R)- and (S)-2-amino-1-butanol – The crucial role of the configuration
作者:Georgi M. Dobrikov、Violeta Valcheva、Margarita Stoilova-Disheva、Georgi Momekov、Pavleta Tzvetkova、Angel Chimov、Vladimir Dimitrov
DOI:10.1016/j.ejmech.2011.11.035
日期:2012.2
The synthesis of 47 structurally diverse compounds incorporating the (R)-2-amino-1-butanol motif has been realized. Ten of these compounds were found to exhibit in vitro specific activity against Mycobacterium tuberculosis H37Rv in a MIC range of 0.65 mu M-14.03 mu M. Five of the most active compounds 11, 22, 23, 31 and 42(5.7-11.1 fold more active than ethambutol) can be outlined with very low cytotoxicity towards human embryonal kidney non-tumour cells (SI ranging from 91.2 to 375.4). For the purpose of comparison the (S)-enantiomers of these most active compounds have been synthesized and evaluated towards M. tuberculosis H(37)Rv showing no activity even at 20-32 fold higher concentrations. (C) 2011 Elsevier Masson SAS. All rights reserved.
Anticonvulsant Activity of Enantiomeric<i>N-trans</i>-Cinnamoyl Derivatives of 2-Aminopropan-1-ols and 2-Aminobutan-1-ols
of epileptogenesis: pilocarpine-induced status prevention. Additionally, derivatives of 2-aminopropan-1-ols were tested in benzodiazepine-resistant electrographic status epilepticus rat model as well as in vitro for inhibition of isoenzymes of cytochrome P450. All of the tested compounds showed promising anticonvulsantactivity in MES. For R(-)-(2E)-N-(1-hydroxypropan-2-yl)-3-phenylprop-2-enamide pharmacological
Highly diastereoselective hetero-Diels–Alder reactions of alkenyldihydrooxazoles as an approach to novel pyrimidine derivatives
作者:Mark C. Elliott、Elbertus Kruiswijk
DOI:10.1039/a705571d
日期:——
Chiral 2-alkenyldihydrooxazoles react with two equivalents of aryl and arylsulfonyl isocyanates to give chiral nonracemic dihydropyrimidone derivatives in high yield and with complete diastereocontrol.