Synthesis of (S)-2-amino-7-methoxytetralin and isoindolo[1,2-a]isoquinolinone derivatives from l-aspartic acid
摘要:
This paper describes a new total synthesis for (S)-2-amino-7-methoxytetralin, (S)-7-MeO-AT, from L-aspartic acid in an overall yield of 10% over nine steps. The major loss was ascribed to a key intramolecular Friedel-Crafts cyclization step, which afforded up to 36% yield. Attempts to perform a Friedel-Crafts cyclization of an intermediate phthalimide protected amino alcohol 13 did not give the desired protected (S)-7-MeO-AT. On the other hand, two new isoindolo[1,2-alpha]isoquinolinone derivatives 14 and 15, were isolated in 21 and 11% yield, respectively. The yield of 15 was improved to 70%. (C) 2014 Published by Elsevier Ltd.
Synthesis of Aminomethylene-<i>gem</i>-bisphosphonates Containing an Aziridine Motif: Studies of the Reaction Scope and Insight into the Mechanism
作者:Thomas Cheviet、Suzanne Peyrottes
DOI:10.1021/acs.joc.0c02434
日期:2021.2.19
Study of the reaction’s scope and additional experiments indicates that the transformation proceeds via a new mechanism involving the chelation of lithium ion. This last step is crucial for the reaction to occur and disfavors the aziridine ring-opening. A phosphonate–phosphate rearrangement from a α-hydroxybisphosphonate aziridine intermediate is also proposed for the first time. This reaction provides