Synthesis of 3-substituted 8-hydroxy-3,4-dihydroisocoumarins via successive lateral and ortho-lithiations of 4,4-dimethyl-2-(o-tolyl)oxazoline
作者:Naruki Tahara、Tsutomu Fukuda、Masatomo Iwao
DOI:10.1016/j.tetlet.2004.04.158
日期:2004.6
of 4,4-dimethyl-2-(o-tolyl)oxazoline in THF with sec-BuLi, aromatic or aliphatic aldehydes, sec-BuLi, B(OMe)3, and H2O2 produced the laterally alkylated and ortho-hydroxylated oxazolines in one-pot. Treatment of these products with TFA in aqueous THF provided 3-substituted 8-hydroxy-3,4-dihydroisocoumarins in 44–75% overall yields. This procedure allowed the short synthesis of (±)-hydrangenol and (±)-phyllodulcin
用仲-BuLi,芳族或脂族醛,仲-BuLi,B(OMe)3和H 2 O 2依次处理THF中的4,4-二甲基-2-(邻甲苯基)恶唑啉,生成侧烷基化和邻位一锅中的-羟基化的恶唑啉。用TFA在THF水溶液中处理这些产品可提供3-取代的8-羟基-3,4-二氢异香豆素,总产率为44-75%。该方法允许短合成(±)-羟基和(±)-叶绿素,它们是天然存在的具有药理学意义的3,4-二氢异香豆素。还描述了通过三阴离子中间体更经济地合成(±)-叶绿素。
Expedient syntheses of naturally occurring (±)-3-benzylphthalides and (±)-3-aryl-8-hydroxy-3,4-dihydroisocoumarins: Structure revision of the (±)-3-benzylphthalide isolated from Frullania falciloba
作者:Raghao S. Mali、Kantipudi N. Babu、Prakash G. Jagtap
DOI:10.1039/b106268a
日期:——
A simple synthesis of (±)-3-benzyl-7-methoxyphthalides (1b, 1d and 4a–c) from 7-methoxyphthalides (3a–c) and a novel AlCl3-catalysed conversion of (±)-3-benzyl-7-methoxyphthalides (1d, 4a–c) to 4′-O-methylhydrangenol 5a, 4′,6-O,O-dimethylthunberginol-C 5b and related compounds (5c and 5d) is described.
The Jominy End Quench for Light-Weight Alloy Development
作者:J.W. Newkirk、D.S. MacKenzie
DOI:10.1361/105994900770345809
日期:2000.8.1
The Jominy end quench test is well known as a method of measuring hardenability in steels. In nonferrous alloys, there is a desire to determine the effect of quenching on final properties after heat treating. The Jominy end quench test offers a method for studying many quenching conditions with a minimum of samples. The potential for developing a new understanding of the complex response of nonferrous alloys to processing conditions, especially quenching, will be presented. Examples of the properties measured on Jominy end quench specimens of aluminum and titanium alloys will be presented.
Asahina; Asano, Chemische Berichte, 1930, vol. 63, p. 429,435
作者:Asahina、Asano
DOI:——
日期:——
Ortho-lithiated tertiary benzamides. Chain extension via o-toluamide anion and general synthesis of isocoumarins including hydrangenol and phyllodulcin
作者:Mitsuaki Watanabe、Masanori Sahara、Masaki Kubo、Sunao Furukawa、R. J. Billedeau、V. Snieckus