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. Author manuscript; available in PMC: 2014 Jul 19.
Published in final edited form as: Org Lett. 2013 Jul 9;15(14):3774–3777. doi: 10.1021/ol401723h

Scheme 3.

Scheme 3

Biosynthesis of chaetoviridin A (15) and 4′-propargyl-chaetoviridin A (17) using the HR-PKS CazF, the acyltransferase CazE and the caz pyrano-quinone intermediate cazisochromene (14) in the presence of the alkylating cofactor 1 or 2.