Tandem annulation strategy for the convergent synthesis of benzonaphthopyranones: total synthesis of chartarin and O-methylhayumicinone
A Hauser-initiated tandem annulation has been developed for the rapid regiospecific synthesis of benzonaphthopyranones via formation of two rings in one-pot operation. This strategy has been generalized with benzonaphthopyranones 26, 29, 32, and 35. It has also been employed in a short synthesis of chartarin (3) and O-methylhayumicinone (67).
Ray, Sutapa,Patra, Asit,Mal, Dipakranjan
p. 3253 - 3267
(2008/09/19)
Convergent and rapid assembly of benzonaphthopyranone cores of chartreusin, chrymutasins and hayumicins
A new methodology for the rapid regiospecific synthesis of benzonaphthopyranones has been developed, on the basis of a tactical extension of the Hauser-Kraus annulation. The prowess of the methodology has been illustrated by a short synthesis of chartarin (22b) and a facile entry to the chrymutasin scaffold (26).
Mal, Dipakranjan,Patra, Asit,Roy, Haren
p. 7895 - 7898
(2007/10/03)
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