General Approach to Enantiopure 1-Aminopyrrolizidines: Application to the Asymmetric Synthesis of the Loline Alkaloids
作者:Stephen G. Davies、Ai M. Fletcher、Sean M. Linsdall、Paul M. Roberts、James E. Thomson
DOI:10.1021/acs.joc.3c00047
日期:2023.7.7
The synthesis of a range of loline alkaloids is reported. The C(7) and C(7a) stereogenic centers for the targets were formed by the established conjugate addition of lithium (S)-N-benzyl-N-(α-methylbenzyl)amide to tert-butyl 5-benzyloxypent-2-enoate, ensuing enolate oxidation to give an α-hydroxy-β-amino ester, and then formal exchange of the resultant amino and hydroxyl functionalities (via the intermediacy
An investigation of the alkaloids of Lolium cuneatum
作者:É. Kh. Batirov、S. A. Khamidkhodzhaev、V. M. Malikov、S. Yu. Yunusov
DOI:10.1007/bf00570181
日期:1976.1
Alkaloids of the seeds of Lolium cuneatum
作者:É. Kh. Batirov、V. M. Malikov、S. Yu. Yunusov
DOI:10.1007/bf00570227
日期:1976.1
An efficient synthesis of loline alkaloids
作者:Mesut Cakmak、Peter Mayer、Dirk Trauner
DOI:10.1038/nchem.1072
日期:2011.7
short. Our synthesis incorporates a Sharpless epoxidation, a Grubbs olefin metathesis and an unprecedented transannular aminobromination, which converts an eight-membered cyclic carbamate into a bromopyrrolizidine. The synthesis is marked by a high degree of chemo- and stereoselectivity and gives access to several members of the loline alkaloid family. It delivers sufficient material to support a programme