A Facile Route to Indolo[2,1-a]isoquinolines and Dibenzopyrrocoline Alkaloids
摘要:
Treatment of 1-(2'-bromobenzyl)-3,4-dihydroisoquinolines 2 in the presence of K2CO3 in boiling DMF efficiently provided a variety of alkoxy-substituted indolo[2,1-a]isoquinolines 3. Application of this cyclization to 7-benzyloxyisoquinoline derivatives, followed by further elaboration of the resultant 2-benzyloxy-5,6-dihydroindolo[2,1-a]isoquinolines 16a,b, led to the formal synthesis of dibenzopyrrocoline alkaloids, (+/-)-cryptaustoline (1a) and (+/-)-cryptowoline (1b).
The synthesis of 2′,2′-bis-benzylisoquinolines and their cytostatic activities
摘要:
The novel laudanosine dimers in which two laudanosine units are linked via a C-2 ' biaryl bond have been prepared by a sequence that involves formation of the biaryl bond first and then formation of the isoquinoline rings. Two of these compounds showed higher cytostatic activity on three cancer cell lines than thalicarpine. Crown Copyright (c) 2007 Published by Elsevier Ltd. All rights reserved.