The photochemical or thermal rearrangement of oxaziranes as a method in alkaloid synthesis
作者:Martin E. Kuehne、W.H. Parsons
DOI:10.1016/s0040-4020(01)88617-8
日期:1983.1
The conversion of cyclic ketones to β-arylethyl amine derived imines, their oxidation to oxaziranes and subsequent photochemical rearrangement to N-(β-arylethyl) lactams was probed as a potential method for alkaloid syntheses.
A Convenient Synthesis of 1,1-Disubstituted 1,2,3,4-Tetrahydroisoquinolines via Pictet-Spengler Reaction Using Titanium(IV) Isopropoxide and Acetic-Formic Anhydride.
A synthesis of 1,1-disubstituted 1,2,3,4-tetrahydroisoquinolines (6) was achieved in a highly efficient manner via Pictet-Spengler reaction of arylethylamines (1) and acyclic and cyclic ketones (2) using titanium (IV) isopropoxide and acetic-formic anhydride. The cyclization of the in situ formed acyliminium ion (4) to N-formyl 1,2,3,4-tetrahydroisoquinoline (5) was greatly facilitated by using trifluoroacetic
Intramolecular Acylal Cyclisation (IAC) as an Efficient Synthetic Strategy towards the Total Synthesis of Erythrina Alkaloid Derivatives
作者:Alessandra Monaco、Abil E. Aliev、Stephen T. Hilton
DOI:10.1002/chem.201502436
日期:2015.9.28
Compounds that comprise the erythrinaalkaloid class of natural products are based on a tetracyclic spiroamine framework and exhibit a range of biological activities on the central nervous system. Herein, we report a new and efficient total synthesis of this multiple‐ring system based on an intramolecular acylal cyclisation (IAC) approach. Using this methodology, the tetracyclic core was rapidly assembled