Total Synthesis of (+)-cis-Sylvaticin: Double Oxidative Cyclization Reactions Catalyzed by Osmium
摘要:
The double oxidative cyclization of dienes is a viable procedure for making complex natural products containing cis-THF units. A double deprotection/double oxidative cyclization strategy using catalytic osmium tetroxide was used to construct the bisheterocyclic core of cis-sylvaticin and ultimately confirm its structure. The natural product was then prepared by a short sequence of reactions that is exceptionally concise: the final route being just 13 linear steps and 19 chemical operations in total.
Total Synthesis of (+)-cis-Sylvaticin: Double Oxidative Cyclization Reactions Catalyzed by Osmium
摘要:
The double oxidative cyclization of dienes is a viable procedure for making complex natural products containing cis-THF units. A double deprotection/double oxidative cyclization strategy using catalytic osmium tetroxide was used to construct the bisheterocyclic core of cis-sylvaticin and ultimately confirm its structure. The natural product was then prepared by a short sequence of reactions that is exceptionally concise: the final route being just 13 linear steps and 19 chemical operations in total.
Total synthesis of pyranicin and its deoxygenated analogues was achieved using Cl(2)Pd(CH(3)CN)(2) catalyzed diastereoselective cyclization of the allylic ester as the key step. The inhibitory activity of these compounds for mitochondrial NADH-ubiquinone oxicloreductase (complex I) was poorer than those of ordinary mono-THF acetogenins such as annonacin. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of Pyranicin and Its Inhibitory Action with Bovine Heart Mitochondrial Complex I
Total synthesis of pyranicin was achieved using Cl2Pd(CH3CN)(2)-catalyzed diastereoselective cyclization of the allylic ester as the key step. The inhibitory activity of this compound for mitochondrial NADH-ubiquinone oxidoreductase (complex I) was slightly poorer than that of ordinary mono-THF acetogenins such as cis-solamin.
Total Synthesis of (+)-<i>cis</i>-Sylvaticin: Double Oxidative Cyclization Reactions Catalyzed by Osmium
作者:Timothy J. Donohoe、Robert M. Harris、Jeremy Burrows、Jeremy Parker
DOI:10.1021/ja0660148
日期:2006.10.1
The double oxidative cyclization of dienes is a viable procedure for making complex natural products containing cis-THF units. A double deprotection/double oxidative cyclization strategy using catalytic osmium tetroxide was used to construct the bisheterocyclic core of cis-sylvaticin and ultimately confirm its structure. The natural product was then prepared by a short sequence of reactions that is exceptionally concise: the final route being just 13 linear steps and 19 chemical operations in total.
Concise Syntheses of the Natural Products (+)-Sylvaticin and (+)-<i>cis</i>-Sylvaticin
作者:Timothy J. Donohoe、Robert M. Harris、Oliver Williams、Gráinne C. Hargaden、Jeremy Burrows、Jeremy Parker
DOI:10.1021/ja9049959
日期:2009.9.9
Two concise syntheses of the natural products cis-sylvaticin and sylvaticin are reported, using oxidative cyclization methodology as the key step. A sequential solvolysis/hydride shift/intramolecular reduction cascade was used to establish the trans stereochemistry of one of the THF rings of sylvaticin.