Synthesis 2018; 50(04): 685-699
DOI: 10.1055/s-0036-1589521
review
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Tricyclic Marine Alkaloids, Cylindricines, Lepadiformines, Fasicularin, and Polycitorols: A Recent Update

Atsushi Kaga
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore   eMail: shunsuke@ntu.edu.sg
,
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore   eMail: shunsuke@ntu.edu.sg
› Institutsangaben
This work was supported by funding from Nanyang Technological University (NTU) and the Singapore Ministry of Education (Academic Research Fund Tier 1: 2015-T1-001-040).
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Publikationsverlauf

Received: 31. August 2017

Accepted after revision: 27. September 2017

Publikationsdatum:
14. Dezember 2017 (online)


Abstract

Cylindricines, lepadiformines, and fasicularin are tricyclic marine alkaloids bearing perhydropyrrolo- and pyrido[2,1-j] frameworks having divergent chemical functionalities. They have been isolated from marine tunicates over the last two decades and found to have a range of cytotoxicity such as DNA-alkylating ability. Recently, polycitorols have emerged as a new member of this alkaloid family. Their unique structural features and biological activities have intrigued many researchers and challenged them in their synthesis. This review describes recent syntheses of the tricyclic alkaloids based on key synthetic approaches.

1 Introduction

2 Total and Formal Syntheses

2.1 Overview of Synthetic Strategies

2.2 Azaspirocycle (BC Ring) Approaches

2.3 Indolizidine (AC Ring) Approaches

2.4 Azadecalin (AB Ring) Approaches

2.5 Tandem Cyclization Approaches

3 Summary and Future Perspective