Synthesis 2021; 53(09): 1629-1635
DOI: 10.1055/a-1334-6982
paper

Synthesis of the Common Monomeric Unit of Uroleuconaphins and Viridaphins via Hauser–Kraus Annulation

Kei Kitamura
,
Hinano Kanagawa
,
Chiharu Ozakai
,
Taichi Nishimura
,
Hayato Tokuda
,
Tetsuto Tsunoda
,
Hiroto Kaku
This work was supported by Grant-in-Aid for Scientific Research (C) (No. 19K05427 and No. 20K06955) from Japan Society for the Promotion of Science (JSPS).


Abstract

A stereoselective synthesis of a pyranonaphthoquinone derivative found in aromatic polyketide-derived aphid pigments is reported herein. This approach features the anionic [4+2]-annulation of phthalides with a carbohydrate-derived optically active enone. Additional synthetic steps provide access to the monomer fragment of uroleuconaphins and viridaphins. The optimization for a facile preparation of phthalides bearing sulfonyl or cyano groups are also studied.

Supporting Information



Publication History

Received: 27 November 2020

Accepted after revision: 10 December 2020

Accepted Manuscript online:
10 December 2020

Article published online:
13 January 2021

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