Convergent synthesis of potent COX-2 inhibitor inotilone
摘要:
The first synthesis of potent COX-2 inhibitor inotilone is reported. The convergent route features a Mukaiyarna aldol condensation that generates the target without the use of protecting groups or a separate dehydration step. The approach also highlights a superior regioselective preparation of 1-bromo-2,4-pentanedione involving a bis(silyl enol ether) and NBS. (C) 2007 Elsevier Ltd. All rights reserved.
Synthesis of 2-(Arylsulfonyl)-4-hydroxypyridines by Hetero-Diels-Alder Reaction of 1,3-Bis-Silyl Enol Ethers with Arylsulfonyl Cyanides
作者:Peter Langer、Thomas Emmrich、Helmut Reinke
DOI:10.1055/s-2006-942446
日期:2006.8
2-(Arylsulfonyl)-4-hydroxypyridines were prepared by Hetero-Diels-Alder reaction of 1,3-bis(trimethylsiloxy)buta-1,3-dienes (1,3-bis-silyl enol ethers) with arylsulfonyl cyanides. The products were transformed into 4-aryl-2-(arylsulfonyl)pyridines by Suzuki cross-coupling reactions of the corresponding enol triflates.
Synthesis of 4-(3-hydroxyalkyl)pyrimidines by ring transformation reactions of 2-alkylidenetetrahydrofurans with amidines
作者:Esen Bellur、Peter Langer
DOI:10.1016/j.tet.2006.03.069
日期:2006.6
Domino reactions of amidines with 2-alkylidenetetrahydrofurans, prepared by cyclization of 1,3-dicarbonyl dianions or 1,3-bis-silyl enol ethers with various dielectrophiles, provided an efficient access to 4-(3-hydroxyalkyl)pyrimidines.
Formal Synthesis of Linderone and Lucidone Based on One-Pot Cyclizations of 1,3-Bis-Silyl Enol Ethers with Oxalyl Chloride
作者:Peter Langer、Gopal Bose
DOI:10.1055/s-2005-864803
日期:——
A formal synthesis of the acylcyclopentenediones linderone and lucidone is reported which is based on the cyclization of 2,4-bis(trimethylsilyloxy)-1,3,5-hexatrienes with oxalyl chloride and on the synthesis and functionalization of γ-(2-silyloxypropenylidene)butenolides.
Several functionalized 7,8-benzo-3-hydroxy-9-azabicyclo[3.3.1]non-3-enes were prepared by two-step cyclocondensation of 1,3-bis-silyl enol ethers with isoquinolinium salts.