Manganese triacetate oxidation of methyl 1-hydroxy-2-naphthalene carboxylates
作者:Laura Munive、Víctor Gómez-Calvario、Horacio F. Olivo
DOI:10.1016/j.tetlet.2017.05.028
日期:2017.6
Manganese-triacetate mediated oxidation of 1-hydroxy-2-napthalene carboxylates in benzene under anhydrous conditions delivers the dimerized product. However, acetoxylation on the ortho- or para-position, or oxidation to quinones occurs on the 1-hydroxy-3-substituted 2-napthalene carboxylates depending on the nature of the substituents when the reaction is carried out in a mixture of acetic acid/acetonitrile
Polyhalogeno-allenes and -acetylenes. Part 16. Further 1,3-dipolar cycloadditions to perfluoropropadiene
作者:Gordon B. Blackwell、Robert N. Haszeldine、David R. Taylor
DOI:10.1039/p19830000001
日期:——
The nitrones PhCHN+(R)O–(R = Me, Et, PhCH2, and Ph) react rapidly with perfluoropropadiene to give the corresponding 2-R-4-difluoromethylene-5,5-difluoro-3-phenylisoxazolidines in good yield, although these isoxazolidines are unstable and decompose during catalytic hydrogenation. Perfluoropropadiene also reacts with diazophenylmethane and diazodiphenylmethane, giving 4-difluoromethylene-3,3-difluoro-5-phenyl-
sulfamidate group has been achieved by selective reduction of sulfamidate ketimine groups. The efficient access to the structurally unique glycals allowed the subsequent divergent synthesis of various naturally occurring 3-amino-2,3,6-trideoxysugars. In addition, Lewis acid-promoted glycosylation of the glycals provided a simple solution for the stereoselective installation of O- and C-linked aglycons on
具有顺式稠合环状磺酰胺基团的 3,5-顺式-3- 氨基甘醇的合成已通过选择性还原磺酰胺基酮亚胺基团实现。有效获取结构独特的糖醛允许随后不同地合成各种天然存在的 3-amino-2,3,6-trideoxysugars。此外,Lewis 酸促进的糖基化为氨基糖支架上 O 和 C 连接的糖苷配基的立体选择性安装提供了一种简单的解决方案。
Tamura, Yasumitsu; Wada, Akimori; Okuyama, Shigehiro, Chemical and pharmaceutical bulletin, 1981, vol. 29, # 5, p. 1312 - 1320
Cyclohexenones as Michael Acceptors in the Staunton−Weinreb Annulation: A Simple Stannane Modification for the Synthesis of Polycyclic Systems
作者:Bryan Hill、Russell Rodrigo
DOI:10.1021/ol052058u
日期:2005.11.1
alpha-Toluate anions generated via transmetalation from the corresponding tributyl stannane underwent a Michael addition-Dieckmann condensation sequence with various cyclohexenones. This protocol provides an efficient entry into complex polycyclic systems without the use of beta-alkoxy enones hitherto required for the reaction.