Enantioselective and Regiodivergent Functionalization of<i>N-</i>Allylcarbamates by Mechanistically Divergent Multicatalysis
作者:Edward Richmond、Ismat Ullah Khan、Joseph Moran
DOI:10.1002/chem.201602792
日期:2016.8.22
A pair of mechanistically divergent multicatalytic reaction sequences has been developed consisting of nickel‐catalyzed isomerization of N‐allylcarbamates and subsequent phosphoric‐acid‐catalyzed enantioselective functionalization of the resulting intermediates. By appropriate selection of reaction partners, in situ generated imines and ene‐carbamates are mechanistically partitioned to yield opposing
A new method for the synthesis of N-t-butoxycarbonyl protected α-alkoxy amines from allylamines under neutral conditions
作者:Hisao Nemoto、Hermogenes N. Jimenez、Yoshinori Yamamoto
DOI:10.1039/c39900001304
日期:——
Treatment of the Boc protected allylamines (4) with rhodium catalysts in the presence of alcohols produces N-Boc substituted α-alkoxy amines (5) in high yields, which can be used as a synthetic equivalents of activated imines having an easily deprotectable Boc group.
<i>N</i>-Methyl Allylic Amines from Allylic Alcohols by Mitsunobu Substitution Using <i>N</i>-Boc Ethyl Oxamate
作者:Branca C. van Veen、Steven M. Wales、Jonathan Clayden
DOI:10.1021/acs.joc.1c00918
日期:2021.6.18
synthesis of a range of N-methyl allylicamines. Primary and secondary allylic alcohols underwent a regioselective Mitsunobu reaction with readily accessible N-Boc ethyl oxamate to deliver the corresponding N-Boc allylicamines, including in enantiopure form via stereospecific substitution. Subsequent N-methylation and Boc deprotection without chromatography yielded the amine products as hydrochloride salts
A New Route to 7-Substituted Derivatives of <i>N</i>-{4-[2-(2-Amino-3,4-dihydro-4-oxo-7<i>H</i>-pyrrolo[2,3-<i>d</i>]pyrimidin-5-yl)- ethyl]benzoyl}-<scp>l</scp>-glutamic Acid [ALIMTA (LY231514, MTA)]<sup>1</sup>
作者:Edward C. Taylor、Bin Liu
DOI:10.1021/jo001580l
日期:2001.6.1
unexpected redox reaction to the diethyl esters 9 of a series of 7-substituted derivatives of ALIMTA (LY231514, MTA), from which the target analogues 10 were readily prepared by saponification. Attempted deprotection at position 7 was successful in only one case (9d, R = CH(2)C(6)H(3)(OMe)(2)(-3',4'), which resulted in a known pentultimate precursor (9, R = H) of ALIMTA. The 7-substituted derivatives 10 proved