A rapid access to hydroxylated benz[a]anthraquinones: Hypervalent iodine oxidation of β-naphthols
摘要:
Anionic annulation of phthalide sulfones 3 with quinone monoketals 6, accessible by phenyliodonium diacetate oxidation of naphthols 5, offers a high yielding regiospecific entry to benz[a]anthraquinones 8. Similar annulation of cyanophthalide 13 with 12, followed by photooxygenation of 14 results in a complementary route to the basic skeleton 15 of nonaromatic A-ring angucyclines. (C) 1997, Published by Elsevier Science Ltd.
A rapid access to hydroxylated benz[a]anthraquinones: Hypervalent iodine oxidation of β-naphthols
作者:Dipakranjan Mal、Harendra N. Roy、Nirmal K. Hazra、Susanta Adhikari
DOI:10.1016/s0040-4020(96)01119-2
日期:1997.2
Anionic annulation of phthalide sulfones 3 with quinone monoketals 6, accessible by phenyliodonium diacetate oxidation of naphthols 5, offers a high yielding regiospecific entry to benz[a]anthraquinones 8. Similar annulation of cyanophthalide 13 with 12, followed by photooxygenation of 14 results in a complementary route to the basic skeleton 15 of nonaromatic A-ring angucyclines. (C) 1997, Published by Elsevier Science Ltd.
Convergent and rapid assembly of benzonaphthopyranone cores of chartreusin, chrymutasins and hayumicins
作者:Dipakranjan Mal、Asit Patra、Haren Roy
DOI:10.1016/j.tetlet.2004.08.142
日期:2004.10
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). (C) 2004 Elsevier Ltd. All rights reserved.
Tandem annulation strategy for the convergent synthesis of benzonaphthopyranones: total synthesis of chartarin and O-methylhayumicinone
作者:Sutapa Ray、Asit Patra、Dipakranjan Mal
DOI:10.1016/j.tet.2008.01.039
日期:2008.3
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).