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- W2002693148 abstract "Concise asymmetric syntheses of (−)-lupinine, (+)-isoretronecanol, (+)-5-epi-tashiromine and (R,R)-1-(hydroxymethyl)octahydroindolizine (the azabicyclic core within stellettamides A–C) have been achieved in 8 steps or fewer from commercially available starting materials. The key steps in these syntheses involved the preparation of enantiopure β-amino esters, upon conjugate addition of lithium (R)-N-(p-methoxybenzyl)-N-(α-methyl-p-methoxybenzyl)amide to either ζ-chloro or ζ-hydroxy substituted tert-butyl (E)-hept-2-enoate, or ε-chloro or ε-hydroxy substituted tert-butyl (E)-hex-2-enoate. Activation of the ω-substituent as a leaving group led to SN2-type ring-closure, which occurred with concomitant N-debenzylation via an E1-type deprotection step, to give the corresponding pyrrolidine or piperidine in good yield. Subsequent alkylation of these enantiopure azacycles, followed by a second ring-closure/concomitant N-debenzylation step formed the pyrrolizidine, indolizidine or quinolizidine motif, and reduction with LiAlH4 gave the target compounds in diastereoisomerically and enantiomerically pure form." @default.
- W2002693148 created "2016-06-24" @default.
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- W2002693148 creator A5065969896 @default.
- W2002693148 creator A5066928103 @default.
- W2002693148 date "2014-09-23" @default.
- W2002693148 modified "2023-10-10" @default.
- W2002693148 title "The asymmetric syntheses of pyrrolizidines, indolizidines and quinolizidines via two sequential tandem ring-closure/N-debenzylation processes" @default.
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- W2002693148 doi "https://doi.org/10.1039/c4ob01737d" @default.
- W2002693148 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25300749" @default.
- W2002693148 hasPublicationYear "2014" @default.
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