[EN] SUBSTITUTED N-(1H-INDAZOL-4-YL)IMIDAZO[1, 2-A]PYRIDINE-3- CARBOXAMIDE COMPOUNDS AS CFMS INHIBITORS [FR] COMPOSÉS À BASE DE N-(1H-INDAZOL-4-YL)IMIDAZO[1,2-A]PYRIDINE-3-CARBOXAMIDE SUBSTITUÉ UTILES EN TANT QU'INHIBITEURS DE CFMS
Asymmetric Syntheses of All Stereoisomers of 3-Hydroxyproline; A Constituent of Several Bioactive Compounds
作者:Srivari Chandrasekhar、Togapur Kumar
DOI:10.1055/s-0032-1316734
日期:——
3-hydroxyproline, and its derivatives have been achieved enantioselectively by employing Sharpless asymmetric epoxidation and reductive cyclization as the key steps. Synthesis of an unusual β-hydroxy-α-amino acid, 3-hydroxyproline, and its derivatives have been achieved enantioselectively by employing Sharpless asymmetric epoxidation and reductive cyclization as the key steps.
The stereochemical course of addition of allyltrimethylsilane to protected l-alaninals and l-serinals in the presence of Lewis acids. Total synthesis of cis-(2R,3S)-3-hydroxyproline
作者:D. Gryko、P. Prokopowicz、J. Jurczak
DOI:10.1016/s0957-4166(02)00255-0
日期:2002.6
l-alaninals and l-serinals was investigated and high levels of asymmetric induction were achieved. Stereochemical models for rationalisation of the results obtained are proposed. cis-(2R,3S)-3-Hydroxyproline was synthesised starting from N-Cbz,O-TBS-l-serinal, in which the crucial step involves addition of allyltrimethylsilane to the aldehyde in the presence of SnCl4.
Asymmetric Syntheses of (2<i>R</i>,3<i>S</i>)-3-Hydroxyproline and (2<i>S</i>,3<i>S</i>)-3-Hydroxyproline
作者:Stephen G. Davies、Ai M. Fletcher、Sean M. Linsdall、Paul M. Roberts、James E. Thomson
DOI:10.1021/acs.orglett.8b01736
日期:2018.7.6
Two synthetic routes have been developed for the asymmetricsyntheses of (2R,3S)- and (2S,3S)-3-hydroxyproline. The key synthetic step in each of these strategies is the conversion of protected α,δ-dihydroxy-β-amino esters (either 2,3-anti- or 2,3-syn-configured) into β,δ-dihydroxy-α-amino esters (protected forms thereof), via the intermediacy of the corresponding aziridinium ions. The products of
Allyltrimethylsilane (5) reacted with N-carbobenzoxy-O-tert-butyldimethylsilyl-L serinal (4) to give with high diastereoselectivity syn-adduct 3 which was subsequently transformed into cis-(2R,3S)-3-hydroxyproline (1).
Efficient synthesis of 3-hydroxyprolines and 3-hydroxyprolinols from sugars
作者:Jin Hwan Lee、Jae Eun Kang、Min Suk Yang、Kyu Young Kang、Ki Hun Park
DOI:10.1016/s0040-4020(01)01070-5
日期:2001.12
trans-3-Hydroxy-l-proline 1, trans-3-hydroxy-l-prolinol 2, cis-3-hydroxy-d-proline 3, and cis-3-hydroxy-d-prolinol 4 have been prepared in enantiomerically pure form with chirospecific manner. Key intermediates, 2-amino-3-hydroxy-4-pentenoate 9 and 17, were obtained from d-glucono-δ-lactone and l-gulonic acid γ-lactone via a simultaneous dealkoxyhalogenation.