Synthesis of Some Selectively<i>N</i>-Protected (1<i>S</i>,2<i>S</i>)-<i>p</i>-Nitrophenylserinol–Based Diamino-1,3-dioxanes and Tripodands
作者:Iulia Nagy、Oana Moldovan、Flavia Popa、Pedro Lameiras、Cristina Morar、Carmen Sacalis、Mircea Darabantu
DOI:10.1080/00397911.2015.1078360
日期:2015.10.18
The unconventional methodology for the non-epimerizable cycloacetalization of optically active (1S,2S)-2-amino-1-(4-nitrophenyl)propane-1,3-diol (p-nitrophenylserinol) (condensed H2SO4 96% as solvent and catalyst, i.e., sulfuric transacetalization) producing (2R,4S,5S) diamino-1,3-dioxanes was enlarged by the use of N-protected forms of 2,2-dimethoxyethylamine (DMEA, aminoacetaldehyde dimethylacetal). Conversely, N-protected derivatives of p-nitrophenylserinol were successfully cyclocondensed with DMEA in the same sulfuric conditions. N-Functionalization of DMEA upon treatment with trimesic acid trichloride and cyanuric chloride yielded the corresponding triple amide and melamine, respectively. Their adapted sulfuric transacetalization in triplicate in reaction with arylserinols (aryl: phenyl, p-nitrophenyl) afforded a new series of optically active tripodands.